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A146663 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 67, 67, 379, 379, 2563, 2563, 18843, 18843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.0.0.0.1.0.0.0

.1.0.0.1.1.0.1.1.0.0.1

.1.1.1.0.1.0.1.0.1.1.1

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.1.1.1.0.1.0.1.0.1.1.1

.1.0.0.1.1.0.1.1.0.0.1

.0.0.0.1.0.0.0.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A147128 A147214 A146820 * A146394 A147510 A146474

Adjacent sequences:  A146660 A146661 A146662 * A146664 A146665 A146666

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 25 04:05 EDT 2022. Contains 354048 sequences. (Running on oeis4.)