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A193124 Number of n X n symmetric 0..7 arrays with each element equal to the sum mod 8 of two of its horizontal and vertical neighbors 0

%I

%S 0,1,41,2849,731987,1412507142

%N Number of n X n symmetric 0..7 arrays with each element equal to the sum mod 8 of two of its horizontal and vertical neighbors

%e Some solutions for 4X4

%e ..4..6..3..7....0..4..6..2....0..4..7..5....6..3..5..6....0..4..2..1

%e ..6..2..4..4....4..6..2..4....4..4..2..6....3..6..2..1....4..4..6..7

%e ..3..4..1..5....6..2..0..0....7..2..6..4....5..2..4..7....2..6..4..3

%e ..7..4..5..2....2..4..0..0....5..6..4..0....6..1..7..6....1..7..3..6

%K nonn

%O 1,3

%A _R. H. Hardin_ Jul 16 2011

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Last modified June 28 04:00 EDT 2022. Contains 354903 sequences. (Running on oeis4.)