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A146141 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 barb 1,1 1,2 2,2 2,3 3,2 in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 61, 61, 403, 403, 3415, 3415, 36395, 36395, 473261, 473261, 8291363, 8291363, 204964495, 204964495 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.0.0.0.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.1.0.1.1.0.1.1.0.1.0

.1.1.1.0.0.0.0.0.1.1.1

.0.0.1.0.0.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.0.0.1.0.0

.1.1.1.0.0.0.0.0.1.1.1

.0.1.0.1.1.0.1.1.0.1.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A146402 A146410 A146466 * A062368 A283067 A284185

Adjacent sequences:  A146138 A146139 A146140 * A146142 A146143 A146144

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified September 29 10:30 EDT 2022. Contains 357088 sequences. (Running on oeis4.)