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A183443 Number of n X n binary arrays with every 1 having exactly two king-move neighbors equal to 1 0
1, 5, 18, 72, 2054, 53608, 1744887, 216103851, 39184763856, 11314547102638, 7873316318240100, 9711485486581483616, 21262647899259681841579 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A183450

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A302077 A322773 A145780 * A034551 A052926 A296123

Adjacent sequences:  A183440 A183441 A183442 * A183444 A183445 A183446

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2011

STATUS

approved

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Last modified October 27 13:45 EDT 2021. Contains 348276 sequences. (Running on oeis4.)