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A147081 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 5, 11, 23, 38, 81, 220, 567, 1681, 5209, 18445, 63999, 259065, 1109285, 5269124, 26433601, 148185912, 862407722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.1.1.1.1.1.0.1.0

.0.0.0.0.1.0.1.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.1.0.1.0.0.0.0

.0.1.0.1.1.1.1.1

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A190148 A281875 A143125 * A046628 A262284 A118439

Adjacent sequences:  A147078 A147079 A147080 * A147082 A147083 A147084

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 15 16:42 EDT 2019. Contains 327078 sequences. (Running on oeis4.)