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Search: id:A134654
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| A134654 |
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a(n) = 2a(n-2)+4a(n-3), n > 3. |
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+0
7
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| 0, 0, 2, 1, 4, 10, 12, 36, 64, 120, 272, 496, 1024, 2080, 4032, 8256, 16384, 32640, 65792, 130816, 262144, 524800, 1047552, 2098176, 4194304, 8386560, 16781312, 33550336, 67108864, 134225920, 268419072, 536887296, 1073741824, 2147450880
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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O.g.f.: -x^2(2+x)/[(2x-1)(2x^2+2x+1)] . a(n) = [2^(n-1)-A108520(n-1)]/2 if n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 29 2008
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CROSSREFS
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Adjacent sequences: A134651 A134652 A134653 this_sequence A134655 A134656 A134657
Sequence in context: A071949 A038195 A038521 this_sequence A085421 A121198 A001071
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jan 25 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 29 2008
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