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A193785 Number of n X n symmetric 0..6 arrays with no element equal to the sum or difference mod 7 of any two of its horizontal and vertical neighbors 0

%I

%S 7,120,2424,139320,19924728,7436532066,7374601234200,

%T 19007056742693388,127460953360341764580,2242822081859232960548754

%N Number of n X n symmetric 0..6 arrays with no element equal to the sum or difference mod 7 of any two of its horizontal and vertical neighbors

%e Some solutions for 4X4

%e ..5..2..1..2....3..1..6..4....1..1..3..1....4..4..4..3....3..4..4..4

%e ..2..2..2..2....1..6..6..1....1..1..3..1....4..4..3..3....4..3..3..2

%e ..1..2..2..5....6..6..6..1....3..3..1..6....4..3..3..2....4..3..4..3

%e ..2..2..5..6....4..1..1..3....1..1..6..3....3..3..2..3....4..2..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Aug 05 2011

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)