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A147503 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0110-0111 pattern in any orientation. 1
1, 1, 1, 1, 1, 1, 1, 7, 19, 33, 55, 139, 371, 947, 2907, 11335 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.1.1.0.0.1.1.0

.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.1.1

.0.1.1.0.0.1.1.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A153892 A338410 A038869 * A147465 A053591 A165333

Adjacent sequences:  A147500 A147501 A147502 * A147504 A147505 A147506

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 27 11:23 EDT 2022. Contains 354896 sequences. (Running on oeis4.)