Number of binary [ n,4 ] codes of dimension <= 4 without zero columns.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =30a(6) =56a(7) =107a(8) =200a(9) =372a(10) =680a(11) =1241a(12) =2221a(13) =3938a(14) =6880a(15) =11860a(16) =20148a(17) =33778a(18) =55814a(19) =91007a(20) =146392a(21) =232458a(22) =364462a(23) =564560a(24) =864230a(25) =1308160a(26) =1958700a(27) =2902417a(28) =4258009a(29) =6187350