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A147381 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 33, 33, 101, 101, 381 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,15

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 15 X 15 example

.0.0.0.1.1.0.0.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.0.1.1.0.0.0.1.1.0.0.0.0

.1.0.0.0.0.1.0.0.0.1.0.0.0.0.1

.1.1.1.0.0.1.1.0.1.1.0.0.1.1.1

.0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

.1.1.1.0.0.1.1.0.1.1.0.0.1.1.1

.1.0.0.0.0.1.0.0.0.1.0.0.0.0.1

.0.0.0.0.1.1.0.0.0.1.1.0.0.0.0

.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A147096 A147252 A147104 * A146035 A147190 A146450

Adjacent sequences:  A147378 A147379 A147380 * A147382 A147383 A147384

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 19 05:04 EDT 2022. Contains 353826 sequences. (Running on oeis4.)