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A146671 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 49, 49, 219, 219, 1317, 1317, 9715 (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

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.1.1.0.0.1.0.1.0.0.1.1.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.0.1.1.0.0.0.0.0.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.0.0.0.0.1.1.0.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.1.1.0.0.1.0.1.0.0.1.1.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.1.1.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A146804 A147056 A146631 * A146639 A146703 A146615

Adjacent sequences:  A146668 A146669 A146670 * A146672 A146673 A146674

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 8 20:31 EST 2021. Contains 349596 sequences. (Running on oeis4.)