Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.
A186463
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.
Terms
- a(0) =81a(1) =129a(2) =942a(3) =3186a(4) =13278a(5) =34314a(6) =136086a(7) =399018a(8) =1537038a(9) =4607034a(10) =16888062a(11) =51777498a(12) =185254926a(13) =580089834a(14) =2037893214a(15) =6478793466a(16) =22450788942a(17) =72203998026a(18) =247694103486a(19) =803564559834
External references
- oeis: A186463