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

A295100

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

Terms

    a(0) =1a(1) =3a(2) =20a(3) =201a(4) =2688a(5) =44815a(6) =894528a(7) =20792205a(8) =551518208a(9) =16438822587a(10) =543934387200

External references