|
%I #6 Mar 31 2012 12:36:06
%S 262144,421,6712,79096,214264,287368,443560,801208,1845448,6154456,
%T 19253080,52715464,160802104,443095912,1131273304,3286379416,
%U 9131561848,24052744744,69820713688,195342687640,520410211576,1490887628248
%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
%C Diagonal of A186881
%H R. H. Hardin, <a href="/A186872/b186872.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for 4X4
%e ..0..3..3..0....0..0..0..3....0..0..0..0....0..2..1..1....0..1..1..2
%e ..2..0..3..3....0..0..0..0....2..0..0..0....0..0..2..1....0..0..1..1
%e ..2..2..0..3....0..0..0..0....0..2..0..0....0..0..0..2....0..0..0..1
%e ..0..2..2..0....2..0..0..0....1..0..2..0....0..0..0..0....0..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 28 2011
| 