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

A375540

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

Terms

    a(0) =1a(1) =2a(2) =12a(3) =126a(4) =1880a(5) =36250a(6) =856212a(7) =23928758a(8) =772172592a(9) =28253043378

External references