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A098140
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63-gonal numbers: a(n) = n*(61*n - 59)/2.
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1
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0, 1, 63, 186, 370, 615, 921, 1288, 1716, 2205, 2755, 3366, 4038, 4771, 5565, 6420, 7336, 8313, 9351, 10450, 11610, 12831, 14113, 15456, 16860, 18325, 19851, 21438, 23086, 24795, 26565, 28396, 30288, 32241, 34255, 36330, 38466
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = n*(61*n - 59)/2.
a(0)=0, a(1)=1, a(2)=63, a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). - Harvey P. Dale, Jun 09 2011
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MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {0, 1, 63}, 50] (* Harvey P. Dale, Jun 09 2011 *)
CoefficientList[Series[x (1 + 60 x) / (1 - x)^3, {x, 0, 40}], x] (* Vincenzo Librandi, Aug 16 2017 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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