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A146274 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 173, 173, 3199, 3199, 51175, 51175, 661225, 661225, 13583567, 13583567, 722876085, 722876085, 45766294357, 45766294357, 3140059939559 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A146647 A146719 A147469 * A147037 A146796 A146836

Adjacent sequences:  A146271 A146272 A146273 * A146275 A146276 A146277

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 6 23:36 EDT 2022. Contains 357270 sequences. (Running on oeis4.)