A243233 Number of isoscent sequences of length n with exactly seven ascents.

436, 45146, 1830826, 45369299, 826196076, 12168531813, 153430719591, 1718168937922, 17525279293159, 165802561604726, 1474718822704304, 12459599973722036, 100805357136035992, 786035745070774366, 5938016635175121413, 43645066989439738813, 313228673357655892678

Offset: 12

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 = 12..100

Crossrefs

Column k=7 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, 7):
seq(a(n), n=12..35);