Column 3 of triangle A141760.

Terms

a(0) =1a(1) =1a(2) =4a(3) =23a(4) =175a(5) =1678a(6) =19579a(7) =270683a(8) =4342447a(9) =79498622a(10) =1638471038a(11) =37592670383a(12) =951214496814