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Search: id:A131666
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| 0, 0, 1, 1, 2, 3, 7, 14, 29, 57, 114, 227, 455, 910, 1821, 3641, 7282, 14563, 29127, 58254, 116509, 233017, 466034, 932067, 1864135, 3728270, 7456541, 14913081, 29826162, 59652323, 119304647, 238609294, 477218589, 954437177, 1908874354
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OFFSET
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0,5
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FORMULA
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a(n+1)-2a(n) = 0, 1, -1, 0, -1, 1, ... is the hexaperiodic A092220 (corrected Sep 24 2007).
O.g.f.: = (-1+x)*x^2/((2*x-1)*(x+1)*(x^2-x+1)) - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 23 2007
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CROSSREFS
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Sequence in context: A131300 A078043 A135258 this_sequence A034065 A034075 A019595
Adjacent sequences: A131663 A131664 A131665 this_sequence A131667 A131668 A131669
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 14 2007
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