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

%I A243235 #4 Jun 01 2014 18:53:16
%S A243235 5,7894,1224994,78795771,3067107659,85773445272,1895106633310,
%T A243235 35082703708444,565885383903338,8174846220800924,107914203931103343,
%U A243235 1321652161255079196,15194953405886326264,165524034548480907270,1721272958146506221402,17191653626679380069342
%N A243235 Number of isoscent sequences of length n with exactly nine ascents.
%H A243235 Joerg Arndt and Alois P. Heinz, <a href="/A243235/b243235.txt">Table of n, a(n) for n = 14..100</a>
%p A243235 b:= proc(n, i, t) option remember; `if`(n<1, 1, expand(add(
%p A243235       `if`(j>i, x, 1) *b(n-1, j, t+`if`(j=i, 1, 0)), j=0..t+1)))
%p A243235     end:
%p A243235 a:= n-> coeff(b(n-1, 0$2), x, 9):
%p A243235 seq(a(n), n=14..35);
%Y A243235 Column k=9 of A242351.
%K A243235 nonn
%O A243235 14,1
%A A243235 _Joerg Arndt_ and _Alois P. Heinz_, Jun 01 2014