a(n) = n! * [x^n] 1/sqrt(1 - 2*n*x).

A292784

a(n) = n! * [x^n] 1/sqrt(1 - 2*n*x).

Terms

    a(0) =1a(1) =1a(2) =12a(3) =405a(4) =26880a(5) =2953125a(6) =484989120a(7) =111289483305

External references