A146836 - OEIS

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A146836

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 41, 41, 159, 159, 789, 789

(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

.0.0.1.0.0.1.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.1.1.0.0.1.0.0.0.1.0.0.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.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

.1.1.0.0.0.0.0.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.0.0.1.0.0.0.1.0.0.1.1

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.0.1.0.0.1.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A146274 A147037 A146796 * A146780 A146860 A146185

Adjacent sequences: A146833 A146834 A146835 * A146837 A146838 A146839

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

EXTENSIONS

Repaired example. - R. H. Hardin, Nov 05 2008

STATUS

approved