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A147504 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 21, 83, 317, 1047, 4695, 28979, 194029, 1669287, 18050319 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.0.0.0

.0.1.1.0.0.1.0.0

.0.1.1.1.0.1.1.1

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.1.1.1.0.1.1.1.0

.0.0.1.0.0.1.1.0

.0.0.0.0.0.1.1.1

CROSSREFS

Sequence in context: A273454 A094834 A303647 * A217783 A221862 A216271

Adjacent sequences:  A147501 A147502 A147503 * A147505 A147506 A147507

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)