A146176 - OEIS

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A146176

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

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 79, 79, 513, 513, 4397, 4397, 30071, 30071

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

OFFSET

1,11

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.0.1.0.1.0.0.0.0

.1.0.0.1.1.0.1.1.0.0.1

.1.0.1.0.0.0.0.0.1.0.1

.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

.1.0.1.0.0.0.0.0.1.0.1

.1.0.0.1.1.0.1.1.0.0.1

.0.0.0.0.1.0.1.0.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

CROSSREFS

Sequence in context: A141245 A147032 A146261 * A147136 A146844 A146193

Adjacent sequences: A146173 A146174 A146175 * A146177 A146178 A146179

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved