Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Terms

a(0) =9a(1) =81a(2) =252a(3) =558a(4) =1035a(5) =1719a(6) =2646a(7) =3852a(8) =5373a(9) =7245a(10) =9504a(11) =12186a(12) =15327a(13) =18963a(14) =23130a(15) =27864a(16) =33201a(17) =39177a(18) =45828a(19) =53190a(20) =61299a(21) =70191a(22) =79902a(23) =90468a(24) =101925a(25) =114309a(26) =127656a(27) =142002a(28) =157383a(29) =173835