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A147122 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 25, 83, 469, 2129, 11813, 86099, 830451, 8876513, 123941743, 2095230143 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.0.1.0.0.1.1.1.1

.1.1.0.0.0.0.0.1

.0.1.1.1.0.0.0.1

.1.0.0.0.1.1.1.0

.1.0.0.0.0.0.1.1

.1.1.1.1.0.0.1.0

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A296669 A131537 A250555 * A051229 A058919 A018212

Adjacent sequences:  A147119 A147120 A147121 * A147123 A147124 A147125

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 15 15:20 EDT 2018. Contains 316236 sequences. (Running on oeis4.)