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A071138 CONTINUANT transform of {sigma(n)}, 1, 3, 4, 7, 6, 12, ... (A000203). 1
1, 4, 17, 123, 755, 9183, 74219, 1122468, 14666303, 265115922, 3196057367, 89754722198, 1259762168139, 30324046757534, 729036884348955, 22630467461575139, 408077451192701457, 15937651063976931962, 319161098730731340697, 13420703797754693241236, 429781682626880915060249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..200

N. J. A. Sloane, Transforms

MAPLE

with(numtheory):

a:= proc(n) option remember; `if`(n<0, 0,

      `if`(n=0, 1, sigma(n) *a(n-1) +a(n-2)))

    end:

seq(a(n), n=1..30);  # Alois P. Heinz, Aug 06 2013

CROSSREFS

Cf. A000203.

Sequence in context: A032115 A054927 A307794 * A032325 A032335 A208803

Adjacent sequences:  A071135 A071136 A071137 * A071139 A071140 A071141

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 11 2002

STATUS

approved

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Last modified August 24 18:12 EDT 2019. Contains 326295 sequences. (Running on oeis4.)