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A147098 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 7, 13, 29, 143, 539, 2419, 11799, 70509, 422003, 3669313, 30560805, 384390343 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.1

.1.0.0.0.0.1.0.1

.1.0.1.0.0.0.0.1

.1.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A134270 A091565 A025249 * A109291 A340067 A199218

Adjacent sequences:  A147095 A147096 A147097 * A147099 A147100 A147101

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 18 08:19 EDT 2021. Contains 348066 sequences. (Running on oeis4.)