A011845 - OEIS

A011845

a(n) = floor( binomial(n,8)/9).

0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 5, 18, 55, 143, 333, 715, 1430, 2701, 4862, 8398, 13996, 22610, 35530, 54479, 81719, 120175, 173586, 246675, 345345, 476905, 650325, 876525, 1168700, 1542684, 2017356, 2615091, 3362260, 4289780, 5433721, 6835972, 8544965, 10616471

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,11

LINKS

Table of n, a(n) for n=0..41.

Index entries for linear recurrences with constant coefficients, signature (8, -28, 56, -70, 56, -28, 8, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -8, 28, -56, 70, -56, 28, -8, 1).

FORMULA

a(n) = floor(binomial(n+1,9)/(n+1)). [Gary Detlefs, Nov 23 2011]

MATHEMATICA

Table[Floor[Binomial[n, 8] / 9], {n, 1, 50}] (* Vincenzo Librandi, Oct 15 2015 *)

PROG

(PARI) a(n) = binomial(n, 8)\9; \\ Michel Marcus, Oct 14 2015

(Magma) [Binomial(n, 8) div 9: n in [0..45]]; // Vincenzo Librandi, Oct 15 2015

CROSSREFS

Cf. A000031, A001037, A028723, A051168.

A column of triangle A011847.

Sequence in context: A272558 A081492 A263318 * A099450 A360191 A344847

Adjacent sequences: A011842 A011843 A011844 * A011846 A011847 A011848