A011852 a(n) = floor(binomial(n,6)/6).

0, 0, 0, 0, 0, 0, 0, 1, 4, 14, 35, 77, 154, 286, 500, 834, 1334, 2062, 3094, 4522, 6460, 9044, 12435, 16824, 22432, 29516, 38371, 49335, 62790, 79170, 98962, 122713, 151032, 184594, 224150, 270526, 324632

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Index entries for linear recurrences with constant coefficients, signature (7, -22, 41, -50, 41, -22, 7, 0, -6, 15, -19, 9, 9, -19, 15, -6, 0, 6, -15, 19, -9, -9, 19, -16, 13, -22, 35, -35, 22, -13, 16, -19, 9, 9, -19, 15, -6, 0, 6, -15, 19, -9, -9, 19, -15, 6, 0, -7, 22, -41, 50, -41, 22, -7, 1).

Crossrefs

A column of triangle A011857.

Programs

PARI

a(n) = binomial(n, 6)\6; \\ Michel Marcus, Jan 28 2018

Sage

[floor(binomial(n,6)/6) for n in range(0,37)] # Zerinvary Lajos, Dec 01 2009