Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically.
A207886
Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =177a(3) =575a(4) =1360a(5) =3106a(6) =8652a(7) =22114a(8) =53620a(9) =139806a(10) =360132a(11) =899952a(12) =2300016a(13) =5898082a(14) =14925674a(15) =37975776a(16) =96993892a(17) =246541258a(18) =627068300a(19) =1598281686a(20) =4067781864a(21) =10349972204a(22) =26357799164a(23) =67101532924a(24) =170780094962
External references
- oeis: A207886