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A191479 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 3 king-move neighboring 1s 1
2, 8, 42, 445, 8336, 273578, 16060725, 1663317205, 304789975903, 99026690954574, 56934478978072688, 57952230532394115913, 104449989219446543530778, 333288010626782017792094457, 1882901103468898454919475637369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A153524 A153552 A295199 * A197935 A267619 A012917

Adjacent sequences:  A191476 A191477 A191478 * A191480 A191481 A191482

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 03 2011

STATUS

approved

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Last modified June 21 00:35 EDT 2021. Contains 345328 sequences. (Running on oeis4.)