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

14,1

Links

Joerg Arndt and Alois P. Heinz, Table of n, a(n) for n = 14..100

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);

Crossrefs

Column k=9 of A242351.

Sequence in context: A117711 A203689 A116140 * A145530 A067816 A076629

Adjacent sequences: A243232 A243233 A243234 * A243236 A243237 A243238

Keyword

nonn

Author

Joerg Arndt and Alois P. Heinz, Jun 01 2014

Status

approved