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A192996 Number of n X n symmetric 0..2 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..2 introduced in lower triangular row major order 0
0, 1, 1, 6, 35, 530, 10783, 383882, 21009035, 1882728991, 268304587720, 61675577951783, 22726670515099851, 13466905835356717045 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for 8X8 containing a 2

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

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

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

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

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

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

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

..1..1..1..1..1..2..2..2....2..2..2..1..1..1..1..1....2..2..2..1..1..1..2..2

CROSSREFS

Sequence in context: A268139 A051337 A267224 * A192997 A152128 A115457

Adjacent sequences:  A192993 A192994 A192995 * A192997 A192998 A192999

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 14 2011

STATUS

approved

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Last modified October 20 03:04 EDT 2021. Contains 348099 sequences. (Running on oeis4.)