A147383 - OEIS

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A147383

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 9, 25, 47, 195, 767, 3745, 18201, 111311, 686767, 6208537, 52616577

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.1.0

.0.0.0.0.0.1.1.0

.0.0.1.1.0.1.0.0