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

A208014

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

Terms

    a(0) =9a(1) =81a(2) =225a(3) =841a(4) =2304a(5) =6084a(6) =18496a(7) =53824a(8) =150544a(9) =435600a(10) =1263376a(11) =3610000a(12) =10368400a(13) =29899024a(14) =85895824a(15) =246741264a(16) =709902736a(17) =2041232400a(18) =5866947216a(19) =16869853456a(20) =48507419536a(21) =139454446096a(22) =400947305616

External references