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A113870
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a(n) = a(n-1) + 2^(k(n)), where k(n) is the n-th term of the sequence formed by k(1)=0 together with the numbers A042963.
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0
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1, 3, 7, 39, 103, 615, 1639, 9831, 26215, 157287, 419431, 2516583, 6710887, 40265319, 107374183, 644245095, 1717986919, 10307921511, 27487790695, 164926744167, 439804651111, 2638827906663, 7036874417767, 42221246506599
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..24.
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FORMULA
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G.f.: (3+x-40*x^2)/(4*(-1+x)*(-1+4*x)*(1+4*x)). - Vaclav Kotesovec, Nov 28 2012
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CROSSREFS
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Cf. A099974, A112627, A080355, A080567, A099969, A099970, A099971.
Sequence in context: A061931 A057203 A056250 * A209326 A074582 A105621
Adjacent sequences: A113867 A113868 A113869 * A113871 A113872 A113873
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski, Jan 27 2006
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EXTENSIONS
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Edited with better definition and offset corrected by Omar E. Pol, Jan 08 2009
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STATUS
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approved
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