a(n) = (n!)^3 * [x^n] hypergeom([], [1, 1], x)^4.

A287699

a(n) = (n!)^3 * [x^n] hypergeom([], [1, 1], x)^4.

Terms

    a(0) =1a(1) =4a(2) =52a(3) =1192a(4) =36628a(5) =1297504a(6) =50419096a(7) =2099649808a(8) =92239977748

External references