A243234 Number of isoscent sequences of length n with exactly eight ascents.

72, 22702, 1726823, 67907889, 1795511707, 36321261053, 605440292330, 8715982350668, 111865311047525, 1309224069548063, 14207107757575607, 144766250416253170, 1398869193142980670, 12919066626921248461, 114754676548076467734, 985458803547385212585

Offset: 13

Author

Joerg Arndt and Alois P. Heinz, Jun 01 2014

Keywords

• nonn

Links

• Joerg Arndt and Alois P. Heinz, Table of n, a(n) for n = 13..100

Crossrefs

Column k=8 of A242351.

Programs

Maple

b:= proc(n, i, t) option remember; `if`(n<1, 1, expand(add(
      `if`(j>i, x, 1) *b(n-1, j, t+`if`(j=i, 1, 0)), j=0..t+1)))
    end:
a:= n-> coeff(b(n-1, 0$2), x, 8):
seq(a(n), n=13..35);