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

A293318

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

Terms

    a(0) =1a(1) =4a(2) =86a(3) =3480a(4) =208054a(5) =16486680a(6) =1628301884a(7) =192666441968

External references