A147222 - OEIS

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A147222

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 21, 45, 251, 1189, 5949, 38111, 398367, 3732199

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.1.1.0.0.1.1.1.0

.0.1.0.0.0.0.1.1

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.1.1.0.0.0.0.1.0

.0.1.1.1.0.0.1.1

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A063500 A372290 A102603 * A199767 A044098 A044479

Adjacent sequences: A147219 A147220 A147221 * A147223 A147224 A147225

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved