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A012268
Duplicate of
A009655
.
+0
1
0, 0, 2, 6, 22, 100, 788, 8568, 103416, 1307808, 17722512, 264361680, 4373968080
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 3 22:15 EST 2009. Contains 170310 sequences.
AT&T Labs Research
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