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A147096 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 31, 31, 73, 73, 307, 307, 1451, 1451, 6775, 6775, 33773, 33773, 192865 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.1.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A086530 A147402 A052551 * A147252 A147104 A147381

Adjacent sequences:  A147093 A147094 A147095 * A147097 A147098 A147099

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 30 15:21 EDT 2020. Contains 334726 sequences. (Running on oeis4.)