a(n) = n! * [x^n] exp(n*arcsin(x)).

Terms

a(0) =1a(1) =1a(2) =4a(3) =30a(4) =320a(5) =4420a(6) =74880a(7) =1502200a(8) =34816000a(9) =915267600a(10) =26907545600a(11) =874679634400