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A011905 [ n(n-1)(n-2)/23 ]. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

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

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: A139423 A026053 A276031 * A306674 A098065 A123690

Adjacent sequences:  A011902 A011903 A011904 * A011906 A011907 A011908

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 5 05:13 EST 2021. Contains 349530 sequences. (Running on oeis4.)