G.f. A(x) satisfies: Sum_{n>=0} x^(n*(n+1)/2) * A(x)^n = Sum_{n>=0} x^n * (1+x)^(n*(n+1)/2).

A325298

G.f. A(x) satisfies: Sum_{n>=0} x^(n*(n+1)/2) * A(x)^n = Sum_{n>=0} x^n * (1+x)^(n*(n+1)/2).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =17a(5) =56a(6) =189a(7) =673a(8) =2561a(9) =10321a(10) =43612a(11) =192439a(12) =884702a(13) =4227202a(14) =20942697a(15) =107363291a(16) =568547892a(17) =3105231155a(18) =17467413871a(19) =101069173004a(20) =600841031279

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