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A147190 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 41, 41, 163, 163, 697, 697, 3471, 3471, 20005, 20005 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.1.0.0.0.0.0.1.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.1.1.0.0.1.1.0.1.1.0.0.1.1

.0.1.1.1.0.1.0.1.0.1.1.1.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.1.1.1.0.1.0.1.0.1.1.1.0

.1.1.0.0.1.1.0.1.1.0.0.1.1

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.1.0.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A147104 A147381 A146035 * A146450 A233810 A263869

Adjacent sequences:  A147187 A147188 A147189 * A147191 A147192 A147193

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)