The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #7 Mar 31 2012 12:35:53
%S 231,5215,100935,1803007,30722151
%N Number of (n+1)X(n+1) 0..6 arrays with every 2X2 subblock summing to 12
%C Diagonal of A183672
%e Some solutions for 3X3
%e ..6..4..6....0..5..0....4..1..4....0..4..0....5..1..5....2..3..2....4..4..3
%e ..1..1..1....3..4..3....3..4..3....5..3..5....4..2..4....1..6..1....0..4..1
%e ..6..4..6....3..2..3....3..2..3....0..4..0....1..5..1....4..1..4....5..3..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2011