A071138 CONTINUANT transform of {sigma(n)}, 1, 3, 4, 7, 6, 12, ... (A000203).

1, 4, 17, 123, 755, 9183, 74219, 1122468, 14666303, 265115922, 3196057367, 89754722198, 1259762168139, 30324046757534, 729036884348955, 22630467461575139, 408077451192701457, 15937651063976931962, 319161098730731340697, 13420703797754693241236, 429781682626880915060249

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 * A337521 A032325 A032335

Adjacent sequences: A071135 A071136 A071137 * A071139 A071140 A071141

Keyword

nonn

Author

N. J. A. Sloane, Jun 11 2002

Status

approved