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A147008 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 13, 3, 37, 7, 103, 14, 365 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A353318 A239871 A147389 * A147365 A147064 A147228

Adjacent sequences:  A147005 A147006 A147007 * A147009 A147010 A147011

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 5 03:25 EDT 2022. Contains 357240 sequences. (Running on oeis4.)