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

A208690

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

Terms

    a(0) =9a(1) =81a(2) =189a(3) =927a(4) =2889a(5) =11727a(6) =40581a(7) =154359a(8) =554733a(9) =2062215a(10) =7512453a(11) =27700479a(12) =101402109a(13) =372809655a(14) =1367107173a(15) =5021003151a(16) =18423673101a(17) =67639822407a(18) =248247487989a(19) =911283026751

External references