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A146601 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 9, 17, 69, 301, 1753, 10173, 84391, 728377, 10351543, 132350331, 2998203817 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.1

.1.0.0.0.1.1.1.1

.1.1.1.1.0.0.0.0

.0.0.0.0.1.1.1.1

.1.1.1.1.0.0.0.1

.1.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A282764 A319018 A101304 * A121955 A151793 A118852

Adjacent sequences:  A146598 A146599 A146600 * A146602 A146603 A146604

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 20 01:14 EDT 2019. Contains 326136 sequences. (Running on oeis4.)