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Half the number of lower triangles of an (n+1) X (n+1) 0..7 array with no element equal to the average of its horizontal and vertical neighbors.
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%I #6 May 24 2024 13:17:38

%S 184,82057,279618492,7416076339907,1525002446582690839,

%T 2430369828996738172677912

%N Half the number of lower triangles of an (n+1) X (n+1) 0..7 array with no element equal to the average of its horizontal and vertical neighbors.

%C Column 7 of A194615.

%e Some solutions for 3 X 3

%e ..6......0......5......0......2......1......4......7......6......4......0

%e ..4.1....1.4....6.5....2.6....0.1....2.6....0.6....4.2....5.4....3.6....6.4

%e ..1.6.5..7.5.2..4.0.5..1.5.7..0.6.2..4.3.1..0.6.4..0.6.3..3.7.6..1.2.7..1.7.6

%Y Cf. A194615.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 30 2011