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A049680
a(n)=(L(n)+L(2n))/2, where L=
A000032
(the Lucas sequence).
+0
2
2, 2, 5, 11, 27, 67, 170, 436, 1127, 2927, 7625, 19901, 52002, 135982, 355745, 930931, 2436527, 6377807, 16695530, 43706576, 114420627, 299549527, 784218605, 2053091161, 5375030402, 14071960442, 36840786845, 96450296411
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Maintained by
N. J. A. Sloane
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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