G.f. satisfies A^4 = BINOMIAL(A)^3.

A090355

G.f. satisfies A^4 = BINOMIAL(A)^3.

Terms

    a(0) =1a(1) =3a(2) =15a(3) =109a(4) =1086a(5) =14178a(6) =232906a(7) =4647006a(8) =109376595a(9) =2967406345a(10) =91130074437

External references