Column 1 of triangle A111544.

Terms

a(0) =1a(1) =2a(2) =9a(3) =57a(4) =441a(5) =3933a(6) =39249a(7) =430677a(8) =5137641a(9) =66103533a(10) =911973249a(11) =13428837477a(12) =210259505241