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A193224 Number of n X n symmetric 0..6 arrays with no element equal to the sum mod 7 of any two of its horizontal and vertical neighbors 0
7, 216, 19002, 5354628, 4811755110, 13792037832498, 126348317344567128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 4X4

..0..2..3..2....0..3..4..6....0..1..6..4....0..1..6..0....0..2..4..0

..2..0..6..0....3..0..2..6....1..0..3..1....1..0..3..6....2..0..3..5

..3..6..0..2....4..2..0..2....6..3..0..2....6..3..1..2....4..3..2..4

..2..0..2..5....6..6..2..1....4..1..2..0....0..6..2..0....0..5..4..0

CROSSREFS

Sequence in context: A193877 A193186 A114939 * A319538 A290974 A145107

Adjacent sequences: A193221 A193222 A193223 * A193225 A193226 A193227

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 18 2011

STATUS

approved

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Last modified December 1 00:42 EST 2022. Contains 358453 sequences. (Running on oeis4.)