A147391 - OEIS

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A147391

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10001-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 9, 13, 37, 78, 329, 1384, 8131, 38082, 266677, 1697877

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.0.0

.0.1.0.1.1.1.1.1

.1.1.0.1.0.0.0.1

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.1.0.0.0.1.0.1.1

.1.1.1.1.1.0.1.0

.0.0.1.0.0.1.1.0

CROSSREFS

Sequence in context: A146723 A146422 A147352 * A241677 A146225 A219257

Adjacent sequences: A147388 A147389 A147390 * A147392 A147393 A147394

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved