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A146607 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 59, 59, 237, 237, 1193, 1193, 6925, 6925, 46535, 46535, 385115, 385115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.1.0.0.0.1.1.0.1.1.0.0.0.1

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.0.0.1.0.0.0.0.0.1.0.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.1.0.0.0.0.0.1.0.0.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.1.0.0.0.1.1.0.1.1.0.0.0.1

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A147343 A147433 A146903 * A147072 A146068 A146911

Adjacent sequences:  A146604 A146605 A146606 * A146608 A146609 A146610

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 15 23:51 EDT 2022. Contains 353687 sequences. (Running on oeis4.)