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A146914 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 9, 9, 19, 19, 57, 57, 217, 217, 857, 857, 3619, 3619, 18707, 18707, 117969, 117969, 876253, 876253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A151970 A049644 A147472 * A146253 A147040 A146277

Adjacent sequences:  A146911 A146912 A146913 * A146915 A146916 A146917

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 6 08:44 EDT 2020. Contains 333268 sequences. (Running on oeis4.)