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

Terms

a(0) =9a(1) =81a(2) =271a(3) =643a(4) =1271a(5) =2239a(6) =3641a(7) =5581a(8) =8173a(9) =11541a(10) =15819a(11) =21151a(12) =27691a(13) =35603a(14) =45061a(15) =56249a(16) =69361a(17) =84601a(18) =102183a(19) =122331a(20) =145279a(21) =171271a(22) =200561a(23) =233413a(24) =270101a(25) =310909a(26) =356131a(27) =406071a(28) =461043a(29) =521371