Number of 3 X n binary matrices such that any 2 rows have a common 1, up to column permutations.

Terms

a(0) =0a(1) =1a(2) =8a(3) =37a(4) =127a(5) =358a(6) =876a(7) =1926a(8) =3894a(9) =7359a(10) =13156a(11) =22451a(12) =36829a(13) =58396a(14) =89896a(15) =134844a(16) =197676a(17) =283917a(18) =400368a(19) =555313a(20) =758747a(21) =1022626a(22) =1361140a(23) =1791010a(24) =2331810a(25) =3006315a(26) =3840876a(27) =4865823a(28) =6115897a(29) =7630712