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A146615 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 49, 49, 235, 235, 1289, 1289, 9339 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.0.1.0.1.0.0.0.0.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.1.0.1.1.0.0.0.1.1.0.1.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.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

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.1.0.1.1.0.0.0.1.1.0.1.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.0.0.0.0.1.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A146671 A146639 A146703 * A146735 A146711 A146402

Adjacent sequences:  A146612 A146613 A146614 * A146616 A146617 A146618

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

EXTENSIONS

Example repaired. - R. H. Hardin, Nov 05 2008

STATUS

approved

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Last modified July 5 14:54 EDT 2022. Contains 355099 sequences. (Running on oeis4.)