Column 2 of triangle A185624.

Terms

a(0) =1a(1) =2a(2) =11a(3) =66a(4) =470a(5) =3997a(6) =40079a(7) =466448a(8) =6208551a(9) =93297013a(10) =1565360082a(11) =29047075343a(12) =591275224311