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A147037 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 181, 181, 1975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.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

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146719 A147469 A146274 * A146796 A146836 A146780

Adjacent sequences:  A147034 A147035 A147036 * A147038 A147039 A147040

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 5 12:19 EDT 2022. Contains 357255 sequences. (Running on oeis4.)