Number of 3 X n binary matrices with no zero rows or columns, up to row and column permutation.

Terms

a(0) =1a(1) =5a(2) =17a(3) =42a(4) =91a(5) =180a(6) =328a(7) =565a(8) =930a(9) =1470a(10) =2248a(11) =3344a(12) =4849a(13) =6881a(14) =9579a(15) =13104a(16) =17649a(17) =23442a(18) =30736a(19) =39833a(20) =51074a(21) =64842a(22) =81574a(23) =101766a(24) =125959a(25) =154771a(26) =188883a(27) =229044a(28) =276085a(29) =330926