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A147144 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 17, 17, 39, 39, 127, 127, 681, 681, 3913, 3913, 21369, 21369, 147701, 147701, 1344439, 1344439, 15252227 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.1.1.0.1.1.0.0

.0.1.1.0.0.0.1.1.0

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.0.0.1.1.0.1.1.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A263869 A174583 A226781 * A152113 A146149 A263795

Adjacent sequences:  A147141 A147142 A147143 * A147145 A147146 A147147

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 6 16:34 EDT 2022. Contains 357270 sequences. (Running on oeis4.)