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A193502 Number of n X n symmetric 0..5 arrays with no element equal to the product mod 6 of any two of its horizontal and vertical neighbors 0
6, 140, 12163, 3951864, 4827971048, 22259396528054, 386289720759306945, 25279342643584489219120, 6231309566262596674328016996 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for 4X4

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

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

..3..4..3..1....0..1..4..3....5..4..0..1....3..1..3..1....5..0..5..5

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

CROSSREFS

Sequence in context: A012785 A012818 A078450 * A059488 A241015 A245986

Adjacent sequences:  A193499 A193500 A193501 * A193503 A193504 A193505

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 29 2011

STATUS

approved

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Last modified October 21 00:18 EDT 2021. Contains 348119 sequences. (Running on oeis4.)