A146727 - OEIS

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A146727

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 35, 35, 157, 157, 741, 741, 4435, 4435, 44453, 44453

(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

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.0.0.0.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.1.1.1.0.1.0.1.0.1.1.1

.1.0.1.1.0.0.0.1.1.0.1

.0.0.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.0.0.1.1.0.1

.1.1.1.0.1.0.1.0.1.1.1

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.0.0.0.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A147136 A146844 A146193 * A146426 A146051 A146229

Adjacent sequences: A146724 A146725 A146726 * A146728 A146729 A146730

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved