A011844 a(n) = floor(C(n,7)/8).

0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 15, 41, 99, 214, 429, 804, 1430, 2431, 3978, 6298, 9690, 14535, 21318, 30644, 43263, 60087, 82225, 111003, 148005, 195097, 254475, 328696, 420732, 534006, 672452, 840565, 1043460

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Index entries for linear recurrences with constant coefficients, signature (7, -21, 35, -35, 21, -7, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -7, 21, -35, 35, -21, 7, -1).

Crossrefs

A column of triangle A011847.

Programs

Mathematica

Floor[Binomial[Range[0,40],7]/8] (* Harvey P. Dale, Apr 23 2011 *)

Formula

a(n) = floor(binomial(n+1,8)/(n+1)). [Gary Detlefs, Nov 23 2011]