a(n) = A000032(n)*A000045(n)*A000108(n).

Terms

a(0) =0a(1) =1a(2) =6a(3) =40a(4) =294a(5) =2310a(6) =19008a(7) =161733a(8) =1411410a(9) =12563408a(10) =113624940a(11) =1041158846a(12) =9645100416a(13) =90182859700a(14) =849966450840