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

Terms

a(0) =9a(1) =81a(2) =252a(3) =784a(4) =1736a(5) =3844a(6) =7130a(7) =13225a(8) =21965a(9) =36481a(10) =56154a(11) =86436a(12) =125832a(13) =183184a(14) =255516a(15) =356409a(16) =480585a(17) =648025a(18) =850080a(19) =1115136a(20) =1429824a(21) =1833316a(22) =2305862a(23) =2900209a(24) =3588221a(25) =4439449a(26) =5414990a(27) =6604900a(28) =7956720a(29) =9585216