Number of binary [ n,7 ] codes without 0 columns.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =7a(8) =35a(9) =170a(10) =847a(11) =4408a(12) =24297a(13) =143270a(14) =901491a(15) =5985278a(16) =41175203a(17) =287813284a(18) =2009864185a(19) =13848061942a(20) =93369988436a(21) =613030637339