A147395 - OEIS

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A147395

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 23, 39, 63, 165

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.0.0

.0.0.0.0.1.0.1.0.0.0

.1.0.1.1.1.0.1.0.0.0

.1.0.0.0.0.0.1.1.1.1

.1.1.1.1.0.0.0.0.0.1

.0.0.0.1.0.1.1.1.0.1

.0.0.0.1.0.1.0.0.0.0

.0.0.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A031023 A199714 A054302 * A302906 A144390 A024843

Adjacent sequences: A147392 A147393 A147394 * A147396 A147397 A147398

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved