A124464 Row 4 of rectangular table A124460.
1, 5, 19, 73, 302, 1325, 6032, 28193, 134825, 659011, 3290110, 16764206, 87103106, 461090076, 2484768459, 13621130998, 75906831145, 429768775851, 2470872560536, 14418770507660, 85367306874021, 512604419523512
Offset: 0
Keywords
Programs
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PARI
{a(n)=local(m=max(n,4),R=vector(m+1,r,vector(m+1,c,binomial(r+c-2,c-1)))); for(i=0,m,for(r=0,m,R[r+1]=Vec(sum(c=0,m,x^c*Ser(R[c+1])^r+O(x^(m+1))))));R[5][n+1]}
Formula
G.f.: A(x) = Sum_{n>=0} x^n*R_n(x)^4, where R_n(x) is the g.f. of row n in table A124460 and satisfies: R_n(x) = Sum_{k>=0} x^k * R_k(x)^n for n>=0.