Column 3 of triangle A117396.

Terms

a(0) =1a(1) =4a(2) =19a(3) =109a(4) =739a(5) =5779a(6) =51139a(7) =504739a(8) =5494339a(9) =65369539a(10) =843747139a(11) =11741033539a(12) =175200329539