Number of n X 2 0..5 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 6, and upper left element zero.
A230588
Number of n X 2 0..5 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 6, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =8a(4) =30a(5) =120a(6) =506a(7) =2144a(8) =9030a(9) =37920a(10) =159218a(11) =668792a(12) =2809710a(13) =11804040a(14) =49589354a(15) =208325456a(16) =875178390a(17) =3676643760a(18) =15445668962a(19) =64887621608a(20) =272594409150
External references
- oeis: A230588