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A192765 Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 2 and with new values 0..2 introduced in lower triangular row major order 1
0, 0, 0, 73, 6486, 1127280, 455878230, 457521123971, 1154811828698984, 7352963503841306070, 118143132683839293396707, 4790379790527104234486857472, 490170667488489136298923882507851 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A015260 A089788 A292013 * A177094 A116241 A105322

Adjacent sequences:  A192762 A192763 A192764 * A192766 A192767 A192768

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 09 2011

STATUS

approved

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Last modified July 29 06:36 EDT 2021. Contains 346340 sequences. (Running on oeis4.)