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A146068 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 69, 69, 389, 389, 2287, 2287, 15081, 15081, 141721, 141721, 1694175, 1694175, 23795099, 23795099 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.1.1.0.1.1.1.0.0

.1.1.0.0.1.0.1.0.0.1.1

.0.1.0.0.0.0.0.0.0.1.0

.0.1.1.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.1.1.0

.0.1.0.0.0.0.0.0.0.1.0

.1.1.0.0.1.0.1.0.0.1.1

.0.0.1.1.1.0.1.1.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146903 A146607 A147072 * A146911 A146250 A232023

Adjacent sequences: A146065 A146066 A146067 * A146069 A146070 A146071

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified December 5 02:30 EST 2022. Contains 358572 sequences. (Running on oeis4.)