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A202788 Number of nXn binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically 1
1, 12, 398, 45519, 21649928, 41382940317, 314293683119573, 9507225584601580673, 1146261969825089219425266, 550762886957237938187269588944, 1054576957682838130471744629459577753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A202795

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for n=4

..1..1..1..1....0..0..1..1....0..1..1..0....0..1..1..1....0..1..0..0

..0..0..1..1....0..1..0..1....1..0..1..0....0..0..0..1....0..1..1..1

..0..1..1..1....0..0..0..0....1..1..1..0....1..0..0..1....1..1..0..1

..1..0..0..0....1..1..0..0....1..1..1..1....1..1..1..1....1..0..1..0

CROSSREFS

Sequence in context: A193132 A187513 A138914 * A003772 A211078 A197038

Adjacent sequences:  A202785 A202786 A202787 * A202789 A202790 A202791

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 24 2011

STATUS

approved

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Last modified September 23 10:16 EDT 2014. Contains 247123 sequences.