Number of (n+2)X(n+2) 0..4 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.
A186578
Number of (n+2)X(n+2) 0..4 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.
Terms
- a(0) =1953125a(1) =845a(2) =23197a(3) =441869a(4) =1310469a(5) =1673469a(6) =2481269a(7) =4583469a(8) =11621669a(9) =47205469a(10) =171584469a(11) =518633869a(12) =1869857669a(13) =5867355069a(14) =16498082869a(15) =56557420269
External references
- oeis: A186578