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

A207924

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

Terms

    a(0) =9a(1) =81a(2) =144a(3) =576a(4) =1936a(5) =6400a(6) =21904a(7) =73984a(8) =250000a(9) =846400a(10) =2862864a(11) =9684544a(12) =32764176a(13) =110838784a(14) =374964496a(15) =1268499456a(16) =4291298064a(17) =14517358144a(18) =49111878544a(19) =166144281664a(20) =562062085264

External references