Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.
A186473
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.
Terms
- a(0) =256a(1) =362a(2) =4686a(3) =16762a(4) =107353a(5) =305089a(6) =1849873a(7) =5977657a(8) =34498177a(9) =116855689a(10) =634602529a(11) =2242113937a(12) =11691520969a(13) =42863613697a(14) =216155958361a(15) =816595120705
External references
- oeis: A186473