%I
%S 1,1,1,1,4,7,6,3,21,40,40,5,106,226,256,39,519,1257,1591,592,
%T 2441,6880,9655,5365,10836,37026,57411,41104,43784,195632,
%U 335251,288787,146261,1012395,1925220,1921485,249566,5112401,10880591,12302944
%N Expansion of 1/(1x+2x^3+x^4).
%C Row sums of A112517.
%F a(n)=a(n1)2a(n3)a(n4); a(n)=sum{k=0..n, sum{j=0..n, C(j, nj)C(k, jk)(1)^(jk)}}.
%K easy,sign
%O 0,5
%A _Paul Barry_, Sep 09 2005
