A258479 Number of partitions of n into two sorts of parts having exactly 9 parts of the second sort.

1, 11, 67, 298, 1080, 3379, 9453, 24204, 57658, 129335, 275693, 562454, 1104484, 2097247, 3865383, 6937016, 12154390, 20838939, 35029203, 57829458, 93897437, 150150058, 236723504, 368350864, 566187387, 860416074, 1293614426, 1925547270, 2839214222, 4149449828

Offset

9,2

Links

Alois P. Heinz, Table of n, a(n) for n = 9..1000

Maple

b:= proc(n, i) option remember; series(`if`(n=0, 1,
      `if`(i<1, 0, add(b(n-i*j, i-1)*add(x^t*
       binomial(j, t), t=0..min(9, j)), j=0..n/i))), x, 10)
    end:
a:= n-> coeff(b(n$2), x, 9):
seq(a(n), n=9..40);

Crossrefs

Column k=9 of A256193.

Sequence in context: A201605 A268458 A001808 * A035041 A125591 A092841

Adjacent sequences: A258476 A258477 A258478 * A258480 A258481 A258482

Keyword

nonn

Author

Alois P. Heinz, May 31 2015

Status

approved