Number of 3 x n binary matrices without unit columns up to row and column permutations.

Terms

a(0) =1a(1) =3a(2) =7a(3) =14a(4) =25a(5) =41a(6) =64a(7) =95a(8) =136a(9) =189a(10) =256a(11) =339a(12) =441a(13) =564a(14) =711a(15) =885a(16) =1089a(17) =1326a(18) =1600a(19) =1914a(20) =2272a(21) =2678a(22) =3136a(23) =3650a(24) =4225a(25) =4865a(26) =5575a(27) =6360a(28) =7225a(29) =8175