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A193123 Number of n X n symmetric 0..6 arrays with each element equal to the sum mod 7 of two of its horizontal and vertical neighbors 0
0, 1, 37, 2239, 569881, 907290415 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 4X4

..4..2..1..6....0..0..0..0....1..4..3..4....1..4..1..3....2..1..5..2

..2..5..6..5....0..0..0..0....4..1..6..1....4..3..5..2....1..6..3..4

..1..6..1..2....0..0..4..4....3..6..3..4....1..5..4..6....5..3..6..1

..6..5..2..4....0..0..4..1....4..1..4..1....3..2..6..5....2..4..1..2

CROSSREFS

Sequence in context: A297313 A297505 A099807 * A295846 A297719 A296738

Adjacent sequences:  A193120 A193121 A193122 * A193124 A193125 A193126

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 16 2011

STATUS

approved

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Last modified January 28 20:33 EST 2022. Contains 350662 sequences. (Running on oeis4.)