Column 1 of triangle A091604.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =17a(6) =25a(7) =38a(8) =57a(9) =84a(10) =120a(11) =174a(12) =243a(13) =342a(14) =472a(15) =650a(16) =882a(17) =1200a(18) =1605a(19) =2150a(20) =2848a(21) =3767a(22) =4937a(23) =6467a(24) =8396a(25) =10891a(26) =14032a(27) =18046a(28) =23073a(29) =29458