Number of binary [ n,4 ] codes without 0 columns.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =11a(6) =27a(7) =63a(8) =134a(9) =276a(10) =544a(11) =1048a(12) =1956a(13) =3577a(14) =6395a(15) =11217a(16) =19307a(17) =32685a(18) =54413a(19) =89225a(20) =144144a(21) =229647a(22) =360975a(23) =560259a(24) =858967a(25) =1301757a(26) =1950955a(27) =2893102a(28) =4246868a(29) =6174084