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A146906 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 13, 13, 27, 27, 81, 81, 287, 287, 1153, 1153, 4961, 4961 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,15

LINKS

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

EXAMPLE

Maximal 15 X 15 example

.0.0.0.0.0.1.0.0.0.1.0.0.0.0.0

.0.0.0.1.1.1.0.0.0.1.1.1.0.0.0

.0.0.0.0.1.1.1.0.1.1.1.0.0.0.0

.0.1.0.0.1.0.0.0.0.0.1.0.0.1.0

.0.1.1.1.0.0.0.0.0.0.0.1.1.1.0

.1.1.1.0.0.0.0.0.0.0.0.0.1.1.1

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

.1.1.1.0.0.0.0.0.0.0.0.0.1.1.1

.0.1.1.1.0.0.0.0.0.0.0.1.1.1.0

.0.1.0.0.1.0.0.0.0.0.1.0.0.1.0

.0.0.0.0.1.1.1.0.1.1.1.0.0.0.0

.0.0.0.1.1.1.0.0.0.1.1.1.0.0.0

.0.0.0.0.0.1.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A083743 A126990 A128498 * A147449 A208474 A187781

Adjacent sequences:  A146903 A146904 A146905 * A146907 A146908 A146909

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 September 18 15:14 EDT 2014. Contains 246924 sequences.