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0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 16, 18, 20, 22, 24, 26, 29, 31, 34, 36, 39, 42, 45, 48, 52, 55, 59, 62, 66, 70, 74, 78, 82, 86, 90, 95, 99, 104, 108, 113, 118, 123, 128, 134, 139, 145, 150, 156, 162, 168, 174, 180, 186, 192, 199, 205, 212, 218, 225, 232
(list;
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OFFSET
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0,8
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (2, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, 1).
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FORMULA
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a(n) = +2*a(n-1) -a(n-2) +a(n-19) -2*a(n-20) +a(n-21). [From R. J. Mathar, Apr 15 2010]
G.f.: -((x^5 (1+x^8) (1+(-1+x) x (1+x^2)))/(-1+x (2+x (-1+(-1+x)^2 x^17)))) Peter J. C. Moses, Jun 01 2014
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MATHEMATICA
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Table[Floor[(n(n-1))/19], {n, 0, 70}] (* or *) LinearRecurrence[ {2, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, 1}, {0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 16, 18, 20}, 70] (* Harvey P. Dale, May 25 2013 *)
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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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STATUS
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approved
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