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A146599 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation. 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 19, 19, 51, 51, 237, 237, 1335, 1335, 8829 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

EXAMPLE

Maximal 11 X 11 example

.0.0.1.1.1.0.1.1.1.0.0

.0.0.0.0.1.0.1.0.0.0.0

.1.0.0.0.1.0.1.0.0.0.1

.1.0.0.0.1.0.1.0.0.0.1

.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

.1.0.0.0.1.0.1.0.0.0.1

.1.0.0.0.1.0.1.0.0.0.1

.0.0.0.0.1.0.1.0.0.0.0

.0.0.1.1.1.0.1.1.1.0.0

CROSSREFS

Sequence in context: A146655 A146812 A147236 * A107222 A050613 A145940

Adjacent sequences:  A146596 A146597 A146598 * A146600 A146601 A146602

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 25 12:01 EST 2020. Contains 332233 sequences. (Running on oeis4.)