Column 0 of triangle A091700.

Terms

a(0) =1a(1) =2a(2) =7a(3) =23a(4) =78a(5) =264a(6) =895a(7) =3034a(8) =10286a(9) =34872a(10) =118225a(11) =400813a(12) =1358859a(13) =4606881a(14) =15618510a(15) =52950761a(16) =179516682a(17) =608607667a(18) =2063336333a(19) =6995240208a(20) =23715661274a(21) =80402183905a(22) =272584057514a(23) =924129977596