A050389 Reversion of divisor function A000005.

1, -2, 6, -23, 102, -494, 2530, -13456, 73539, -410282, 2326674, -13371039, 77697536, -455749550, 2694915548, -16047294182, 96143497559, -579147165864, 3505497238320, -21309996083015, 130048125280624

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: A248900 A376395 A120346 * A098746 A245389 A088929

Adjacent sequences: A050386 A050387 A050388 * A050390 A050391 A050392

Keyword

sign

Author

Christian G. Bower, Nov 15 1999

Status

approved