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

%I A243234 #5 Jun 01 2014 18:50:38
%S A243234 72,22702,1726823,67907889,1795511707,36321261053,605440292330,
%T A243234 8715982350668,111865311047525,1309224069548063,14207107757575607,
%U A243234 144766250416253170,1398869193142980670,12919066626921248461,114754676548076467734,985458803547385212585
%N A243234 Number of isoscent sequences of length n with exactly eight ascents.
%H A243234 Joerg Arndt and Alois P. Heinz, <a href="/A243234/b243234.txt">Table of n, a(n) for n = 13..100</a>
%p A243234 b:= proc(n, i, t) option remember; `if`(n<1, 1, expand(add(
%p A243234       `if`(j>i, x, 1) *b(n-1, j, t+`if`(j=i, 1, 0)), j=0..t+1)))
%p A243234     end:
%p A243234 a:= n-> coeff(b(n-1, 0$2), x, 8):
%p A243234 seq(a(n), n=13..35);
%Y A243234 Column k=8 of A242351.
%K A243234 nonn
%O A243234 13,1
%A A243234 _Joerg Arndt_ and _Alois P. Heinz_, Jun 01 2014