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A146724 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 25, 25, 197, 197, 1531, 1531, 31791, 31791, 876801, 876801, 39890653, 39890653, 2918403939, 2918403939 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.1.1.0.1

.1.1.1.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.1.1.1

.1.0.1.1.0.1.1.0.1

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147507 A146865 A146740 * A165846 A135218 A133507

Adjacent sequences:  A146721 A146722 A146723 * A146725 A146726 A146727

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 25 22:55 EST 2020. Contains 332270 sequences. (Running on oeis4.)