Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

A207027

Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Terms

    a(0) =8a(1) =64a(2) =168a(3) =558a(4) =1586a(5) =3726a(6) =9450a(7) =21318a(8) =47518a(9) =104470a(10) =220531a(11) =464202a(12) =957412a(13) =1949906a(14) =3940218a(15) =7868976a(16) =15610980a(17) =30742563a(18) =60142488a(19) =117047084a(20) =226575095a(21) =436635184a(22) =837955970a(23) =1601924662a(24) =3051891570a(25) =5795441060a(26) =10972726928

External references