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A147252 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11100-00100-00111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 31, 31, 125, 125, 537, 537, 2497, 2497, 11379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.1.0.0.0.0.0.1.0.0.0

.0.0.0.1.0.0.0.0.0.1.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.1.1.1.0.0.1.0.1.0.0.1.1.1

.0.0.1.0.0.1.0.1.0.0.1.0.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.0.1.0.0.1.0.1.0.0.1.0.0

.1.1.1.0.0.1.0.1.0.0.1.1.1

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.1.0.0.0.0.0.1.0.0.0

.0.0.0.1.0.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A147402 A052551 A147096 * A147104 A147381 A146035

Adjacent sequences:  A147249 A147250 A147251 * A147253 A147254 A147255

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)