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A191481 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 king-move neighboring 1s 1
2, 8, 57, 810, 22619, 1219719, 127845270, 26032342551, 10293291175885, 7905921432890001, 11794027077033857745, 34172420487154828030022, 192310322681418948575293174, 2102041102462630258932750207474 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A133686 A153525 A153553 * A229529 A007347 A308352

Adjacent sequences:  A191478 A191479 A191480 * A191482 A191483 A191484

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 03 2011

STATUS

approved

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Last modified June 15 22:19 EDT 2019. Contains 324145 sequences. (Running on oeis4.)