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A146788 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 27, 27, 85, 85, 337, 337, 1791, 1791 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.1.0.1.1.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

.0.1.0.0.1.0.1.0.0.1.0

.1.1.0.0.1.0.1.0.0.1.1

.1.1.1.1.0.0.0.1.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.0.0.1.1.1.1

.1.1.0.0.1.0.1.0.0.1.1

.0.1.0.0.1.0.1.0.0.1.0

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A056449 A287479 A162436 * A147244 A146575 A100066

Adjacent sequences:  A146785 A146786 A146787 * A146789 A146790 A146791

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 3 19:47 EDT 2020. Contains 336201 sequences. (Running on oeis4.)