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A091986 a(0)=1, a(n) = sigma_3(2n). 3
1, 9, 73, 252, 585, 1134, 2044, 3096, 4681, 6813, 9198, 11988, 16380, 19782, 25112, 31752, 37449, 44226, 55261, 61740, 73710, 86688, 97236, 109512, 131068, 141759, 160454, 183960, 201240, 219510, 257544, 268128, 299593, 335664, 358722, 390096, 442845 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..36.

MATHEMATICA

Join[{1}, Table[DivisorSigma[3, n], {n, 2, 80, 2}]]  (* Harvey P. Dale, Feb 26 2011 *)

CROSSREFS

Bisection of A001158. Cf. A045823.

Sequence in context: A133672 A043079 A099973 * A096129 A291700 A143571

Adjacent sequences:  A091983 A091984 A091985 * A091987 A091988 A091989

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 20 2004

STATUS

approved

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Last modified August 6 19:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)