A147468 - OEIS

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A147468

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 57, 101, 607, 1089, 8859, 19351, 240245, 590155, 24829301, 73370321, 4764846299, 16592732065, 1205158717385, 4890998445663, 529813293025221, 2499121025302115, 491892443613075873

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

OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.1.1.0.1.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0