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A146062 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X3 U in any orientation. 0
1, 1, 1, 5, 13, 37, 193, 825, 4833, 42541, 409765, 5652913, 85462407, 1745289105, 41548085965, 1274611587285, 46878706682435, 2328792987017875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.0.1.0.0.1.0.1

.0.0.0.0.0.0.0.0

.1.0.1.0.0.1.1.1

.1.1.1.0.0.1.0.1

.0.0.0.0.0.0.0.0

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A125734 A146925 A146452 * A201612 A129924 A080143

Adjacent sequences:  A146059 A146060 A146061 * A146063 A146064 A146065

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified June 5 11:06 EDT 2020. Contains 334840 sequences. (Running on oeis4.)