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A066771 5^n cos(2n arctan(1/2)) or denominator of tan(2n arctan(1/2)). +0
10
1, 3, -7, -117, -527, -237, 11753, 76443, 164833, -922077, -9653287, -34867797, 32125393, 1064447283, 5583548873, 6890111163, -98248054847, -761741108157, -2114245277767, 6358056037323, 91004468168113, 387075408075603, 47340744250793, -9392840736385317 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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