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A190631 Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its king- and knight-move neighbors 0
1, 1, 2, 7, 34, 193, 1540, 18231, 316852, 8478040, 322171328 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=4 with a(1,1)=0

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

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

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

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

CROSSREFS

Sequence in context: A020054 A206240 A289720 * A326560 A199475 A241599

Adjacent sequences:  A190628 A190629 A190630 * A190632 A190633 A190634

KEYWORD

nonn

AUTHOR

R. H. Hardin May 14 2011

STATUS

approved

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Last modified February 26 15:26 EST 2021. Contains 341632 sequences. (Running on oeis4.)