A243235 Number of isoscent sequences of length n with exactly nine ascents.

5, 7894, 1224994, 78795771, 3067107659, 85773445272, 1895106633310, 35082703708444, 565885383903338, 8174846220800924, 107914203931103343, 1321652161255079196, 15194953405886326264, 165524034548480907270, 1721272958146506221402, 17191653626679380069342

Offset: 14

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 = 14..100

Crossrefs

Column k=9 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, 9):
seq(a(n), n=14..35);