Sixth column of triangle A028364.

Terms

a(0) =132a(1) =297a(2) =869a(3) =2739a(4) =8986a(5) =30275a(6) =104006a(7) =362738a(8) =1280592a(9) =4566642a(10) =16423581a(11) =59497075a(12) =216901454a(13) =795117015a(14) =2929034130a(15) =10837075830a(16) =40253156520a(17) =150045410430a(18) =561097823490