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A147129 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 7, 25, 45, 79, 171, 569, 1763, 6023, 22593, 106741, 481403, 2734225, 13695379, 86954465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.1

.1.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.1

.1.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A119617 A102027 A031294 * A173825 A269589 A278874

Adjacent sequences:  A147126 A147127 A147128 * A147130 A147131 A147132

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 6 13:01 EDT 2020. Contains 334827 sequences. (Running on oeis4.)