A146432 - OEIS

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A146432

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 101-111-101 pattern in any orientation.

1, 1, 1, 1, 1, 3, 7, 13, 27, 99, 409, 1589, 6601, 37581, 257850, 1891375, 15191004, 148990011, 1749816180, 23213477355, 345838116504, 6040299518273, 124363503908437, 2949204267636321, 79815904035468955, 2501797176290873519

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

OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.0.0.0.0.1.1.1.0

.0.0.0.0.1.0.1.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0