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A213695 Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12.

%I A213695 #5 Jun 02 2025 08:03:31
%S A213695 159,45892,84059234,976919547736,72037480156866493,
%T A213695 33704464361612549676417,100056407652480771734417515110
%N A213695 Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12.
%C A213695 Column 6 of A213697
%e A213695 Some solutions for n=4
%e A213695 ..2..3..5..0..0....4..2..3..3..5....0..5..2..5..0....2..4..1..0..0
%e A213695 ..3..2..1..1..2....2..0..3..1..5....5..1..2..2..6....4..1..0..3..6
%e A213695 ..5..1..0..2..3....3..3..5..4..4....2..2..3..1..4....1..0..0..0..4
%e A213695 ..0..1..2..0..0....3..1..4..4..3....5..2..1..3..1....0..3..0..4..5
%e A213695 ..0..2..3..0..5....5..5..4..3..6....0..6..4..1..0....0..6..4..5..1
%K A213695 nonn
%O A213695 1,1
%A A213695 _R. H. Hardin_ Jun 18 2012