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A146719 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 155, 155, 745, 745 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.0.1.0.1.0.0.0.0.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.1.0.0.1.1.0.1.1.0.0.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.0.0.1.1.0.1.1.0.0.1.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.0.0.0.0.1.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A282501 A147167 A146647 * A147469 A146274 A147037

Adjacent sequences:  A146716 A146717 A146718 * A146720 A146721 A146722

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

EXTENSIONS

Repaired example. - R. H. Hardin, Nov 05 2008

STATUS

approved

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Last modified February 26 09:49 EST 2020. Contains 332277 sequences. (Running on oeis4.)