A011905 - OEIS

%I #14 Jun 13 2023 08:45:03

%S 0,0,0,0,1,2,5,9,14,21,31,43,57,74,94,118,146,177,212,252,297,346,401,

%T 462,528,600,678,763,854,953,1059,1172,1293,1423,1561,1707,1862,2026,

%U 2200,2384,2577,2780,2994,3219

%N [ n(n-1)(n-2)/23 ].

%H <a href="/index/Rec#order_26">Index entries for linear recurrences with constant coefficients</a>, 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).

%F 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

%t Table[Floor[(n(n-1)(n-2))/23],{n,0,50}] (* _Harvey P. Dale_, Aug 06 2013 *)

%K nonn

%O 0,6

%A _N. J. A. Sloane_.