A147012 - OEIS

A147012

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 9, 21, 33, 561, 1063, 16239, 37023, 683049, 1813981, 73918361, 233718771, 15472778911, 58161293145, 6153586919161, 27376781533955, 5115790862761165, 27018006547805491, 8119404508895445151

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OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A243996 A125968 A147068 * A032394 A242988 A063486

Adjacent sequences: A147009 A147010 A147011 * A147013 A147014 A147015

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved