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A146631 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 47, 47, 215, 215, 1109, 1109, 8005 (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

.0.0.1.0.1.0.0.0.1.0.1.0.0

.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

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.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

.0.0.1.0.1.0.0.0.1.0.1.0.0

CROSSREFS

Sequence in context: A283916 A146804 A147056 * A146671 A146639 A146703

Adjacent sequences:  A146628 A146629 A146630 * A146632 A146633 A146634

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 January 28 11:15 EST 2022. Contains 350655 sequences. (Running on oeis4.)