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A192642 Number of n X n symmetric 0..5 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..5 introduced in lower triangular row major order 0
0, 1, 5, 137, 17687, 14219516, 57958907734, 1047298813289261, 73037304771376915268 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

EXAMPLE

Some solutions for 6X6 containing a 5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A012207 A192640 A192641 * A192643 A192644 A134766

Adjacent sequences:  A192639 A192640 A192641 * A192643 A192644 A192645

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 06 2011

STATUS

approved

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Last modified August 1 10:37 EDT 2021. Contains 346385 sequences. (Running on oeis4.)