Column 0 of triangle A116077.

Terms

a(0) =1a(1) =2a(2) =7a(3) =28a(4) =117a(5) =496a(6) =2110a(7) =8968a(8) =38017a(9) =160648a(10) =676626a(11) =2840872a(12) =11892562a(13) =49650368a(14) =206773372a(15) =859186768a(16) =3562780057a(17) =14746127608a(18) =60929182282a(19) =251358948328