cp's OEIS Frontend

A264497 Number of permutations of [n] with exactly ten (possibly overlapping) occurrences of the generalized pattern 13-2.

%I A264497 #6 Nov 14 2015 18:44:17
%S A264497 74,5343,166144,3342042,51052432,643569953,7034981562,68865924682,
%T A264497 617271459112,5148104341380,40431758240544,301784671671496,
%U A264497 2156289904582398,14834095711273034,98718321568669660,637965526671540768,4016617646502383422,24704067590177063445
%N A264497 Number of permutations of [n] with exactly ten (possibly overlapping) occurrences of the generalized pattern 13-2.
%H A264497 Alois P. Heinz, <a href="/A264497/b264497.txt">Table of n, a(n) for n = 8..500</a>
%p A264497 b:= proc(u, o) option remember; `if`(u+o=0, 1, add(
%p A264497        b(u-j, o+j-1), j=1..u) +add(convert(series(
%p A264497        b(u+j-1, o-j)*x^(j-1), x, 11),polynom), j=1..o))
%p A264497     end:
%p A264497 a:= n-> coeff(b(n, 0), x, 10):
%p A264497 seq(a(n), n=8..25);
%Y A264497 Column k=10 of A263776.
%K A264497 nonn
%O A264497 8,1
%A A264497 _Alois P. Heinz_, Nov 14 2015