Column 2 of triangle A109282.

Terms

a(0) =1a(1) =3a(2) =9a(3) =63a(4) =492a(5) =4545a(6) =46935a(7) =530562a(8) =6485211a(9) =84764205a(10) =1176089460a(11) =17217555903a(12) =264670166322