a(n) = A000108(n)*A001764(n).

Terms

a(0) =1a(1) =1a(2) =6a(3) =60a(4) =770a(5) =11466a(6) =188496a(7) =3325608a(8) =61866090a(9) =1199333850a(10) =24030289140a(11) =494663027040