A147072 - OEIS

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A147072

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 61, 61, 211, 211, 741, 741, 3813

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

OFFSET

1,15

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 15 X 15 example

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

.0.0.1.1.1.1.1.0.1.1.1.1.1.0.0

.1.1.0.0.0.0.1.0.1.0.0.0.0.1.1

.0.1.0.0.0.0.0.0.0.0.0.0.0.1.0

.0.1.1.0.0.0.0.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.0.0.0.0.1.1.0

.0.1.0.0.0.0.0.0.0.0.0.0.0.1.0

.1.1.0.0.0.0.1.0.1.0.0.0.0.1.1

.0.0.1.1.1.1.1.0.1.1.1.1.1.0.0

.0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A147433 A146903 A146607 * A146068 A146911 A146250

Adjacent sequences: A147069 A147070 A147071 * A147073 A147074 A147075

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved