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A049681
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a(n)=(L(2n)-L(n))/2, where L=A000032 (the Lucas sequence).
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0
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0, 1, 2, 7, 20, 56, 152, 407, 1080, 2851, 7502, 19702, 51680, 135461, 354902, 929567, 2434320, 6374236, 16689752, 43697227, 114405500, 299525051, 784179002, 2053027082, 5374926720, 14071792681
(list; graph; refs; listen; history; internal format)
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