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A190657 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its diagonal, vertical and horizontal neighbors 0
1, 1, 3, 10, 42, 244, 2031, 22714, 342292, 6943430, 188479666, 6843502049, 331910774405, 21483424837024, 1854744805774187, 213498320443922663, 32758157589935274374 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

EXAMPLE

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

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

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

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

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

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

CROSSREFS

Sequence in context: A007680 A232606 A185621 * A143523 A288813 A306237

Adjacent sequences:  A190654 A190655 A190656 * A190658 A190659 A190660

KEYWORD

nonn

AUTHOR

R. H. Hardin May 16 2011

STATUS

approved

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Last modified October 21 21:46 EDT 2019. Contains 328315 sequences. (Running on oeis4.)