A084631 a(n) = floor(C(n+8,8)/C(n+2,2)).

1, 3, 7, 16, 33, 61, 107, 178, 286, 442, 663, 969, 1384, 1938, 2664, 3605, 4807, 6325, 8222, 10571, 13455, 16965, 21206, 26295, 32364, 39556, 48032, 57970, 69564, 83028, 98595, 116522, 137085, 160585, 187349, 217730, 252109, 290895, 334529, 383484

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..5000

Formula

a(n) = 1 + floor(n*(n+11)*(n^4 +22*n^3 +203*n^2 +902*n +2232)/20160).

Mathematica

Floor[Binomial[Range[0, 50] +8, 6]/28] (* G. C. Greubel, Mar 23 2023 *)

Prog

(Magma) [Floor(Binomial(n+8, 6)/28): n in [0..50]]; // G. C. Greubel, Mar 23 2023
(SageMath) [binomial(n+8, 6)//28 for n in range(51)] # G. C. Greubel, Mar 23 2023

Crossrefs

Cf. A084626.

Sequence in context: A366527 A161810 A318604 * A219846 A229914 A192968

Adjacent sequences: A084628 A084629 A084630 * A084632 A084633 A084634

Keyword

easy,nonn

Author

Paul Barry, Jun 01 2003

Status

approved