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2, 7, 16, 32, 63, 126, 254, 511, 1024, 2048, 4095, 8190, 16382, 32767, 65536, 131072, 262143, 524286, 1048574, 2097151, 4194304, 8388608, 16777215, 33554430, 67108862, 134217727, 268435456, 536870912, 1073741823, 2147483646
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| O.g.f.: (2-x)/[(1-x)(1-2x)(1-x+x^2)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2008
Inverse binomial transform yields 2,(5,4,3) periodically continued with period 3. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2008
a(n+1)-2a(n) = A131290(n+1). 2^(n+2)-a(n) = A131026(n+2).
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CROSSREFS
| Sequence in context: A064468 A074470 A023550 * A023612 A192952 A132738
Adjacent sequences: A130866 A130867 A130868 * A130870 A130871 A130872
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Jul 24 2007
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EXTENSIONS
| Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2008
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