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A107669
a(n) =
A107668
(n)/(n+1)^2.
+0
4
1, 1, 5, 51, 809, 17575, 486460, 16384260, 650574249, 29762953831, 1541719486081, 89201504309927, 5702038255950404, 399105271607867940, 30359621863987241460, 2494052823831234355340, 220067051126228849480649
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.
AT&T Labs Research
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