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A203535 Number of n X n 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1 0
0, 4, 72, 3364, 1700580, 3743237124, 44312000955508, 2752746090434507556, 840982281825673724760300, 1273642755637661083775996170564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203542

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A327882 A003718 A012947 * A013066 A013102 A224900

Adjacent sequences:  A203532 A203533 A203534 * A203536 A203537 A203538

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified May 26 00:08 EDT 2020. Contains 334613 sequences. (Running on oeis4.)