Column 3 of triangle A134090.

Terms

a(0) =1a(1) =4a(2) =30a(3) =215a(4) =1729a(5) =15176a(6) =143814a(7) =1462995a(8) =15876410a(9) =182811992a(10) =2223580281a(11) =28458251185a(12) =381943459065