A146860 - OEIS

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A146860

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 43, 43, 153, 153, 711, 711

(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

.0.0.0.0.1.1.0.1.1.0.0.0.0

.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

.0.0.1.0.0.1.0.1.0.0.1.0.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.1.0.1.1.0.0.0.0.0.1.1.0.1

.0.0.0.0.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.0.0.0.0.1.1.0.1

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.0.1.0.0.1.0.1.0.0.1.0.0

.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

.0.0.0.0.1.1.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146796 A146836 A146780 * A146185 A147399 A147195

Adjacent sequences: A146857 A146858 A146859 * A146861 A146862 A146863

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved