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A086972
n*3^(n-1) + (3^n+1)/2.
+0
2
1, 3, 11, 41, 149, 527, 1823, 6197, 20777, 68891, 226355, 738113, 2391485, 7705895, 24712007, 78918989, 251105873, 796364339, 2518233179, 7942120025, 24988621541, 78452649023, 245818300271, 768835960421, 2400651060089
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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