A146185 - OEIS

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A146185

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 43, 43, 197, 197, 1293, 1293, 11263, 11263, 110807, 110807, 1310257

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

OFFSET

1,11

LINKS

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

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.1.0.1.0.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

.0.1.0.1.1.0.1.1.0.1.0

.0.1.1.0.0.0.0.0.1.1.0

.1.1.1.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0.1.1.1

.0.1.1.0.0.0.0.0.1.1.0

.0.1.0.1.1.0.1.1.0.1.0

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A146836 A146780 A146860 * A147399 A147195 A147045

Adjacent sequences: A146182 A146183 A146184 * A146186 A146187 A146188

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved