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A192643 Number of n X n symmetric 0..6 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..6 introduced in lower triangular row major order 0
0, 1, 5, 137, 17687, 14704140, 73684193256, 2108942003884670 (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 6X6 containing a 6

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

..0..0..1..2..5..5....0..0..1..2..2..5....0..0..1..3..3..5....0..0..1..2..6..6

..1..1..1..3..4..6....0..1..1..3..4..6....1..1..1..0..3..6....0..1..1..3..3..6

..2..2..3..3..4..6....2..2..3..3..4..6....2..3..0..0..4..6....2..2..3..4..4..3

..4..5..4..4..2..2....2..2..4..4..0..0....2..3..3..4..4..6....5..6..3..4..4..3

..4..5..6..6..2..2....5..5..6..6..0..0....5..5..6..6..6..6....5..6..6..3..3..3

CROSSREFS

Sequence in context: A192640 A192641 A192642 * A192644 A134766 A224826

Adjacent sequences:  A192640 A192641 A192642 * A192644 A192645 A192646

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 06 2011

STATUS

approved

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Last modified August 2 18:40 EDT 2021. Contains 346428 sequences. (Running on oeis4.)