A011905 [ n(n-1)(n-2)/23 ].

0, 0, 0, 0, 1, 2, 5, 9, 14, 21, 31, 43, 57, 74, 94, 118, 146, 177, 212, 252, 297, 346, 401, 462, 528, 600, 678, 763, 854, 953, 1059, 1172, 1293, 1423, 1561, 1707, 1862, 2026, 2200, 2384, 2577, 2780, 2994, 3219

Offset

0,6

Links

Table of n, a(n) for n=0..43.

Index entries for linear recurrences with constant coefficients, signature (3, -3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -3, 3, -1).

Formula

G.f.: (x^4 (1+x (-1+x (2+x (-1+x^2 (1+(-1+x) x^2) (1+x+x^6+x^10+x^13))))))/(1+x (-3+x (3+x (-1+(-1+x)^3 x^20)))). - Peter J. C. Moses, Jun 02 2014

Mathematica

Table[Floor[(n(n-1)(n-2))/23], {n, 0, 50}] (* Harvey P. Dale, Aug 06 2013 *)

Crossrefs

Sequence in context: A363459 A026053 A276031 * A306674 A098065 A123690

Adjacent sequences: A011902 A011903 A011904 * A011906 A011907 A011908

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved