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A049680
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a(n)=(L(n)+L(2n))/2, where L=A000032 (the Lucas sequence).
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1
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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
(list; graph; refs; listen; history; internal format)
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