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A147262 Number of n X n binary arrays symmetric under horizontal 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, 199, 377, 3217, 8011, 104473, 273171, 9678777, 30911627, 4517322323, 18623780151, 3664520343941, 18523730792349, 4450318556374425, 27331408113246915 (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

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.1.1.1.0.1.1.1.0

.1.0.0.1.0.1.0.0.1

.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

CROSSREFS

Sequence in context: A142749 A142123 A046006 * A106759 A004926 A004946

Adjacent sequences:  A147259 A147260 A147261 * A147263 A147264 A147265

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 28 08:51 EDT 2022. Contains 354903 sequences. (Running on oeis4.)