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A193483 Number of n X n symmetric 0..4 arrays with each element equal to the product mod 5 of two of its horizontal and vertical neighbors 0
0, 2, 20, 855, 107162, 54992415, 87587532068, 474408802145495 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A168407 A333464 A163594 * A013148 A276892 A006547

Adjacent sequences:  A193480 A193481 A193482 * A193484 A193485 A193486

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 27 2011

STATUS

approved

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Last modified June 30 19:12 EDT 2022. Contains 354945 sequences. (Running on oeis4.)