Column 2 of triangle A141760.

Terms

a(0) =1a(1) =1a(2) =3a(3) =13a(4) =77a(5) =594a(6) =5737a(7) =67216a(8) =931584a(9) =14968423a(10) =274312910a(11) =5657512947a(12) =129866646887