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A146660 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 73, 73, 521, 521, 7411, 7411, 207693, 207693, 7583663, 7583663, 399906057, 399906057 (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

.1.0.0.0.0.0.0.0.1

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146809 A147233 A146817 * A070852 A146596 A146391

Adjacent sequences:  A146657 A146658 A146659 * A146661 A146662 A146663

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 5 13:39 EDT 2022. Contains 355099 sequences. (Running on oeis4.)