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A147024 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 01000-11111-01000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 16, 5, 63, 13, 192, 31, 643, 111, 3455, 377, 19521, 1541, 150737, 10233 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.1.1.1.0.0.0.0

.0.0.0.1.0.1.0.1.0.0.0

.1.1.1.1.1.0.1.1.1.1.1

.0.0.0.1.0.1.0.1.0.0.0

.0.0.0.0.1.1.1.0.0.0.0

.0.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A046531 A289310 A160085 * A146378 A166086 A232101

Adjacent sequences:  A147021 A147022 A147023 * A147025 A147026 A147027

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 21 22:12 EDT 2019. Contains 322328 sequences. (Running on oeis4.)