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已知数列{an}的第1项a1=1,且,则此数列的通项公式an=________.
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已知数列{a
n}的第1项a
1=1,且
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAN0AAAAxCAYAAABeQqzjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAATfSURBVHhe7VzZtawgEDQyczIdkzEUQ2FYREGR
pQdQpObnvXuONE3RZW/IwPADAkCgKgJD1dkwGRAAAgykgxEAgcoIgHSVAcd0QACkgw0AgcoIgHSV
Acd0QKAz0i1sGgY2DCObl5mNw8QW2AAQqIxAP6RbBck42VaB8MrmkZNvAuUq2xum4wh0QjpFMpNj
yzSwUTEQPyBQFYE+SLdMJ68mSKi9XlW8MRkQ6MPTCa9merl1HtkwzjzIxA8I1EegC09nkk4SjhdT
EFrWNzbMqBDognRMhJeyaqnIJkgI4oECTyHQB+meQhfzAgEHAiAd79TJ3p3M8cz/w16AQBkEQLp1
ZSsPP8d54RVN3iyX/Tw0zcuYG6T2k9MF9lr27DjhZNvu0l6AoQCBvAjA08mQcuQtBdVAOLcX8sIN
aUCgl+qlb6dNz/aG0BKe9lO8XKbrIYzuPZ3l2XRr4akzmWL+p5r21tnUzHZvtGyKrE/qrtpA7ztP
ez2C+DrS6X5azL+ZTeNZccJw/iBcDF76mctCd1IUOBon1rW/xLbqcNaXGpe546bkZxWfxSpUCqOP
+r6OdFnW2KCQ53NJ2zByQbgui3XcLvsRPFF9NpR9Hscb5Iy0wSKdPqkxiJI5cotcdhchRxi8q02h
v//Tb+/tk6Qib/MypHN61VKuqKDNnqOE0N+XdRv1go10ajOP84hvddMR9tviI95cThPy+DJCeIv8
Z0frkK6UJ9odRiFCh0h2G7rv9njkdpJ012/Lnvv0hZKbpIzJ/WwOjntDri3Xm/cq2DUxFzqkrMut
cwXSWfldDuROMraCSv4XUg5dD8c2MFcC/2dSn0PFlmWE33r26nyk019F7C/wYnsTR7rUtR0rFUYX
PulDl69mCuWM/8qn26VBumuocg416dP0OjJ5Y2/Dy6tXKxNaynjHqrDd7V3y2jZBrn6Vaw6q/F1W
IK/7Wz7ZqI3w0g4tjYt7RFVoJc/Q/UCxufG/G4O/eDUd9vNzotmvmogjnQ5l49emvI+VanFi+FKv
NOxMTdyh91lXuvyUVZ+fPYplKrzUjUVZQTOJ988kN2NLNmELqEsRSdlUV4Hh4tX2vQqHaUl6Wzbg
73Olru2oiG/Na2lr9/qnyje/lRRjQ3WUZPlJQHoevmsZ5JJ/K6dkE1YF9MaNX8VX45yAvKlvOIIW
gIy8tsitaF3+/TLtwmRKDBQHXSB0iM0d4iYznipN6GSFCAOePAZGUBdDYhAgHwPTIecWFmwG7izN
PkU6uf5AXhLULQbEws+ULqsXVh/ibQRcaUOCp9vOuOnY9K5KFDTs+IQ9fQP/IR1uf07HGyMoCMST
Tn5dPbNpy1TNqqc7Wb479f1C0uH2Z4rtYAwRgWjSKWLpqpPnxMrLPF34hYDbn4m2g2FEBCJJd/JO
vlMRLyOdhYtLN9z+TDQdDKMiEEe6E8m8pyIaIx1uf6aaDsZREYgi3Zlk5MtaE5qwtAWlF1Jw+zMN
aYyiIxBFOrr4iiOphDauEsDtzxX3q+OpvkO6jjcRS28LAZDOu1+4/bktc25DW5DOt0+4/bkNK25M
S5AusGG4/bkxi25AXZAuGF7i9ucG7LgpFUE633a97fbnpkwLyt4hANJ5bONVtz/Dhj+DAEj3ma3E
QlpBAKRrZaeg52cQAOk+s5VYSCsI/ABsNVhVckT8sAAAAABJRU5ErkJggg==
)
,则此数列的通项公式a
n=________.
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