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Search: id:A145593
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| -1, 3, 4, -7, 24, -47, 104, -207, 424, -847, 1704, -3407, 6824, -13647, 27304, -54607, 109224, -218447, 436904, -873807, 1747624, -3495247, 6990504, -13981007, 27962024, -55924047, 111848104, -223696207, 447392424, -894784847
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OFFSET
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0,2
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COMMENT
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From the third entry on, the last digits have period 2.
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FORMULA
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G.f.: (1-x-11x^2)/((1+2x)(1+x)(x-1)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
a(n)=(5*2^n/3-9/2)*(-1)^n+11/6. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
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CROSSREFS
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Sequence in context: A030724 A124082 A056655 this_sequence A042037 A041091 A117764
Adjacent sequences: A145590 A145591 A145592 this_sequence A145594 A145595 A145596
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KEYWORD
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sign
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Oct 14 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
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