Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.

Terms

a(0) =6a(1) =36a(2) =98a(3) =200a(4) =350a(5) =556a(6) =826a(7) =1168a(8) =1590a(9) =2100a(10) =2706a(11) =3416a(12) =4238a(13) =5180a(14) =6250a(15) =7456a(16) =8806a(17) =10308a(18) =11970a(19) =13800a(20) =15806a(21) =17996a(22) =20378a(23) =22960a(24) =25750a(25) =28756a(26) =31986a(27) =35448a(28) =39150a(29) =43100