Binomial transform of A027826.

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =42a(5) =132a(6) =428a(7) =1416a(8) =4745a(9) =16034a(10) =54505a(11) =186166a(12) =638538a(13) =2198692a(14) =7598624a(15) =26350944a(16) =91670946a(17) =319825796a(18) =1118686730a(19) =3921801820a(20) =13775938132a(21) =48473233032a(22) =170815501576a(23) =602710956464