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A011876
[ n(n-1)/23 ].
0
0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 9, 10, 11, 13, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 35, 37, 40, 43, 45, 48, 51, 54, 57, 61, 64, 67, 71, 74, 78, 82, 86, 90, 94, 98, 102, 106, 110, 115, 119, 124, 129, 133, 138, 143, 148, 153, 159, 164, 169, 175, 180, 186, 192, 198
OFFSET
0,9
LINKS
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, 0, 0, 0, 0, 1, -2, 1).
FORMULA
a(n) = +2*a(n-1) -a(n-2) +a(n-23) -2*a(n-24) +a(n-25). [From R. J. Mathar, Apr 15 2010]
G.f: -((x^6 (1+x^2) (1+(-1+x) x (1+x) (1+(-1+x) x) (1+x+x^7)))/(-1+x (2+x (-1+(-1+x)^2 x^21)))) Peter J. C. Moses, Jun 01 2014
CROSSREFS
Sequence in context: A029037 A017875 A039732 * A029036 A192530 A281744
KEYWORD
nonn,easy
AUTHOR
STATUS
approved