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A193614 Number of n X n symmetric 0..7 arrays with no element equal to the sum mod 8 of all its horizontal and vertical neighbors 0

%I

%S 7,343,117649,282480208,4747561627592,558545864083284007

%N Number of n X n symmetric 0..7 arrays with no element equal to the sum mod 8 of all its horizontal and vertical neighbors

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 31 2011

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)