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A147343 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 39, 39, 125, 125, 481, 481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,15

LINKS

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

EXAMPLE

Maximal 15 X 15 example

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.1.0.1.1.1.1.0.0.0

.0.0.1.0.0.1.0.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.0.0.0.1.0.0.1.1.1

.0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

.0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

.1.1.1.0.0.1.0.0.0.1.0.0.1.1.1

.0.0.1.0.0.1.0.0.0.1.0.0.1.0.0

.0.0.0.1.1.1.1.0.1.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A217964 A086739 A147502 * A147433 A146903 A146607

Adjacent sequences:  A147340 A147341 A147342 * A147344 A147345 A147346

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 29 04:50 EDT 2022. Contains 357082 sequences. (Running on oeis4.)