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A088055 a(n) = (n^(n+1)-1)/(n-1) - 1 - n!*n^n, or A031972(n) - A061711(n): sums of geometric progressions minus products of arithmetic progressions. 0
0, 2, 123, 5804, 371095, 33536334, 4149695921, 676438175160, 140586711200271, 36287988888888890, 11388728579602327129, 4270826370748686175140, 1886009588224061851054127, 968725766842917544760889030 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Original definition: a(n) = G(n) - A(n), where G(n) = Sum of the first n terms of a geometric progression with first term n and common ratio n. A(n) = Product of first n terms of an arithmetic progression with first term n and common difference n.

LINKS

Table of n, a(n) for n=1..14.

FORMULA

a(n) = A031972(n) - A061711(n) = (n^(n+1)-1)/(n-1) - 1 - n!*n^n.

CROSSREFS

Cf. A061711, A031972.

Sequence in context: A249504 A230586 A024244 * A065705 A012870 A183720

Adjacent sequences: A088052 A088053 A088054 * A088056 A088057 A088058

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 20 2003

EXTENSIONS

Corrected and extended by David Wasserman, Jun 27 2005

Edited by M. F. Hasler, Feb 12 2013

STATUS

approved

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Last modified December 3 18:08 EST 2022. Contains 358536 sequences. (Running on oeis4.)