%I #5 Mar 31 2012 12:37:06
%S 256,62716,74565586,399249906572,9958775794360374
%N Number of (n+1)X(n+1) 0..3 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in all its horizontal and vertical neighbors
%C Diagonal of A205422
%e Some solutions for n=4
%e ..0..1..1..1..0....1..2..0..2..2....3..3..0..1..0....3..0..0..1..1
%e ..1..1..0..2..3....1..2..0..0..3....0..3..0..3..1....1..3..0..3..2
%e ..2..0..2..3..0....0..3..0..2..3....1..2..1..1..0....0..0..0..3..1
%e ..1..0..3..2..2....0..0..0..3..0....0..0..0..1..2....0..0..1..2..2
%e ..1..1..0..2..1....1..3..0..2..0....1..1..2..0..3....3..2..2..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 27 2012
|