G.f. A(x) satisfies: Sum_{k=0..n} [x^k] A(x)^n = binomial(5*n,2*n).

A244650

G.f. A(x) satisfies: Sum_{k=0..n} [x^k] A(x)^n = binomial(5*n,2*n).

Terms

    a(0) =1a(1) =9a(2) =55a(3) =290a(4) =1430a(5) =6827a(6) =32083a(7) =149665a(8) =696130a(9) =3236140a(10) =15055750a(11) =70149880a(12) =327464665a(13) =1531766715a(14) =7180234915a(15) =33728718755a(16) =158765477150a(17) =748819793990

External references