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A193121 Number of n X n symmetric 0..4 arrays with each element equal to the sum mod 5 of two of its horizontal and vertical neighbors 0
0, 1, 25, 1061, 200989, 167167273, 476648665905, 5119795667808469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A139163 A167257 A012692 * A246923 A066852 A123204

Adjacent sequences:  A193118 A193119 A193120 * A193122 A193123 A193124

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 16 2011

STATUS

approved

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Last modified January 16 23:27 EST 2022. Contains 350377 sequences. (Running on oeis4.)