A147108 - OEIS

A147108

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 191, 363, 3291, 7695, 88749, 226757, 6714813, 20617717, 2114445309, 8176286977, 1364735915577, 6441222315165, 1219041231137751

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A142806 A142086 A070831 * A147116 A142677 A142562

Adjacent sequences: A147105 A147106 A147107 * A147109 A147110 A147111

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved