Column 2 of triangle A166884.

Terms

a(0) =1a(1) =2a(2) =9a(3) =62a(4) =593a(5) =7266a(6) =108720a(7) =1922166a(8) =39212154a(9) =906623004a(10) =23429034168a(11) =669203550906