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A147263 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 105, 105, 825, 825, 13503, 13503, 390699, 390699, 9339771, 9339771 (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

.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

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.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

CROSSREFS

Sequence in context: A147125 A147109 A147117 * A146234 A146182 A147149

Adjacent sequences:  A147260 A147261 A147262 * A147264 A147265 A147266

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 25 19:56 EDT 2022. Contains 354851 sequences. (Running on oeis4.)