Column 3 of triangle A111553.

Terms

a(0) =1a(1) =4a(2) =24a(3) =184a(4) =1664a(5) =17024a(6) =192384a(7) =2366144a(8) =31362304a(9) =444907264a(10) =6720628224a(11) =107674883584