Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.
A208556
Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =225a(3) =1089a(4) =3969a(5) =16641a(6) =65025a(7) =263169a(8) =1046529a(9) =4198401a(10) =16769025a(11) =67125249a(12) =268402689a(13) =1073807361a(14) =4294836225a(15) =17180131329a(16) =68718952449a(17) =274878955521
External references
- oeis: A208556