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A050389 Reversion of divisor function A000005. 2
1, -2, 6, -23, 102, -494, 2530, -13456, 73539, -410282, 2326674, -13371039, 77697536, -455749550, 2694915548, -16047294182, 96143497559, -579147165864, 3505497238320, -21309996083015, 130048125280624 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

N. J. A. Sloane, Transforms

Index entries for reversions of series

FORMULA

G.f. A(x) satisfies: A(x) = x - Sum_{k>=2} d(k) * A(x)^k. - Ilya Gutkovskiy, Apr 22 2020

CROSSREFS

Cf. A000005, A050390.

Sequence in context: A231444 A248900 A120346 * A098746 A245389 A088929

Adjacent sequences:  A050386 A050387 A050388 * A050390 A050391 A050392

KEYWORD

sign

AUTHOR

Christian G. Bower, Nov 15 1999

STATUS

approved

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Last modified May 28 12:27 EDT 2020. Contains 334681 sequences. (Running on oeis4.)