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A117808
a(n) = Floor[((2 + Sqrt[3])^n + (2 - Sqrt[3])^n)/4]
+0
1
3, 13, 181, 2521, 489061, 6811741, 1321442641, 18405321661, 3570537526921, 9647591076297901
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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