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A147029 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 593, 593, 11281, 11281, 273235, 273235, 6759617, 6759617 (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

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A294691 A147172 A146825 * A146258 A146173 A146190

Adjacent sequences:  A147026 A147027 A147028 * A147030 A147031 A147032

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 18 02:41 EST 2022. Contains 350410 sequences. (Running on oeis4.)