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

Terms

a(0) =1a(1) =1a(2) =4a(3) =30a(4) =320a(5) =4380a(6) =73152a(7) =1443008a(8) =32837632a(9) =846829008a(10) =24406425600a(11) =777438110240