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A113870 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. 1
1, 3, 7, 39, 103, 615, 1639, 9831, 26215, 157287, 419431, 2516583, 6710887, 40265319, 107374183, 644245095, 1717986919, 10307921511, 27487790695, 164926744167, 439804651111, 2638827906663, 7036874417767, 42221246506599 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..300

FORMULA

G.f.: (3+x-40*x^2)/(4*(-1+x)*(-1+4*x)*(1+4*x)). - Vaclav Kotesovec, Nov 28 2012

CROSSREFS

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

KEYWORD

nonn

AUTHOR

Artur Jasinski, Jan 27 2006

EXTENSIONS

Edited with better definition and offset corrected by Omar E. Pol, Jan 08 2009

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)