2nd column of A145142.

Terms

a(0) =1a(1) =3a(2) =11a(3) =50a(4) =634a(5) =6804a(6) =71868a(7) =789984a(8) =11025936a(9) =174509280a(10) =2940903360a(11) =51707242080a(12) =987781034304