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A081295
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a(n) = (-1)^(n+1)* coefficient of x^n in sum(k>=1,x^k/(1+2*x^k)).
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4
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1, 1, 5, 9, 17, 29, 65, 137, 261, 497, 1025, 2085, 4097, 8129, 16405, 32905, 65537, 130845, 262145, 524793, 1048645, 2096129, 4194305, 8390821, 16777233, 33550337, 67109125, 134225865, 268435457, 536855053, 1073741825, 2147516553
(list; graph; refs; listen; history; internal format)
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