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A147402 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 29, 29, 107, 107, 505, 505, 2403, 2403 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 13 X 13 example

.0.0.1.0.0.0.0.0.0.0.1.0.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

.1.1.0.1.1.1.0.1.1.1.0.1.1

.0.1.1.0.0.1.0.1.0.0.1.1.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.0.1.1.0.0.0.0.0.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.0.0.0.0.1.1.0.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.1.1.0.0.1.0.1.0.0.1.1.0

.1.1.0.1.1.1.0.1.1.1.0.1.1

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.0.1.0.0.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A187781 A263794 A086530 * A052551 A147096 A147252

Adjacent sequences:  A147399 A147400 A147401 * A147403 A147404 A147405

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 31 08:09 EDT 2020. Contains 334747 sequences. (Running on oeis4.)