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

Terms

a(0) =9a(1) =81a(2) =270a(3) =630a(4) =1215a(5) =2079a(6) =3276a(7) =4860a(8) =6885a(9) =9405a(10) =12474a(11) =16146a(12) =20475a(13) =25515a(14) =31320a(15) =37944a(16) =45441a(17) =53865a(18) =63270a(19) =73710a(20) =85239a(21) =97911a(22) =111780a(23) =126900a(24) =143325a(25) =161109a(26) =180306a(27) =200970a(28) =223155a(29) =246915