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A147056 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 47, 47, 193, 193, 927, 927 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.0.0.1.0.1.0.0.0.0.0

.0.1.0.0.1.1.0.1.1.0.0.1.0

.1.1.0.1.0.0.0.0.0.1.0.1.1

.0.1.1.1.0.0.0.0.0.1.1.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.1.0.0.0.0.0.1.1.1.0

.1.1.0.1.0.0.0.0.0.1.0.1.1

.0.1.0.0.1.1.0.1.1.0.0.1.0

.0.0.0.0.0.1.0.1.0.0.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A213031 A094248 A146804 * A146631 A146671 A146639

Adjacent sequences:  A147053 A147054 A147055 * A147057 A147058 A147059

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 23 03:24 EDT 2014. Contains 248411 sequences.