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A190630 Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its knight-move neighbors 0
1, 4, 6, 8, 63, 563, 10027, 209836, 6257561, 259705792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A087271 A067797 A203633 * A013285 A013289 A013288

Adjacent sequences:  A190627 A190628 A190629 * A190631 A190632 A190633

KEYWORD

nonn

AUTHOR

R. H. Hardin May 14 2011

STATUS

approved

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Last modified April 20 09:21 EDT 2021. Contains 343125 sequences. (Running on oeis4.)