Number of n X 2 0..7 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero.
A230509
Number of n X 2 0..7 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =2a(4) =8a(5) =32a(6) =118a(7) =440a(8) =1664a(9) =6354a(10) =24360a(11) =93440a(12) =358246a(13) =1372824a(14) =5259424a(15) =20147874a(16) =77183048a(17) =295680992a(18) =1132742102a(19) =4339515256a(20) =16624624832a(21) =63688678130a(22) =243990165864a(23) =934721535168
External references
- oeis: A230509