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

A208841

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

Terms

    a(0) =9a(1) =81a(2) =171a(3) =855a(4) =2421a(5) =9801a(6) =31419a(7) =116919a(8) =394965a(9) =1419849a(10) =4902939a(11) =17375031a(12) =60551541a(13) =213310665a(14) =746231931a(15) =2622329271a(16) =9188418069a(17) =32255749449a(18) =113096449755a(19) =396852637239

External references