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A192844 Number of n X n symmetric 0..5 arrays with each element equal to at least two horizontal or vertical neighbors, containing at least one 5 and with new values 0..5 introduced in lower triangular row major order 0
0, 0, 0, 0, 0, 1, 110, 120266, 36138620, 24354992195, 18944127297891 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for 7X7

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A329338 A203718 A143750 * A234512 A343181 A028673

Adjacent sequences:  A192841 A192842 A192843 * A192845 A192846 A192847

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 11 2011

STATUS

approved

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Last modified June 27 13:59 EDT 2022. Contains 354896 sequences. (Running on oeis4.)