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A167534
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a(n) = 79*n - a(n-1) for n>0, a(0)=9.
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5
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9, 70, 88, 149, 167, 228, 246, 307, 325, 386, 404, 465, 483, 544, 562, 623, 641, 702, 720, 781, 799, 860, 878, 939, 957, 1018, 1036, 1097, 1115, 1176, 1194, 1255, 1273, 1334, 1352, 1413, 1431, 1492, 1510, 1571, 1589, 1650, 1668, 1729, 1747, 1808, 1826
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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Sum_{n>=0} (-1)^n/a(n) = cot(9*Pi/79)*Pi/79. - Amiram Eldar, Feb 24 2023
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MATHEMATICA
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CoefficientList[Series[(9 + 61 x + 9 x^2)/((1 + x) (1 - x)^2), {x, 0, 50}], x] (* Vincenzo Librandi, Jun 06 2014 *)
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PROG
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(Magma) [(79/4)-(43/4)*(-1)^n+(79/2)*n: n in [0..50]]; // Vincenzo Librandi, Jun 06 2014
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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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