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A190656 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king-move neighbors 0
1, 1, 1, 2, 5, 20, 86, 486, 3495, 31938, 368832, 5412981, 100924470, 2390092072, 71686035608, 2726514241955, 131508854502755, 8039052200861454, 622678408143680652 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Some solutions for n=5 with a(1,1)=0

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

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

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

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

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

CROSSREFS

Sequence in context: A012768 A170947 A006228 * A262166 A262167 A262168

Adjacent sequences:  A190653 A190654 A190655 * A190657 A190658 A190659

KEYWORD

nonn

AUTHOR

R. H. Hardin May 16 2011

STATUS

approved

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Last modified April 19 16:58 EDT 2019. Contains 322283 sequences. (Running on oeis4.)