login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A307601 Expansion of Product_{k>=1} (1 - x^k/(1 + x)). 6
1, -1, 0, 0, -1, 2, -4, 7, -11, 16, -21, 26, -30, 33, -33, 28, -14, -13, 59, -131, 238, -390, 598, -873, 1225, -1663, 2194, -2822, 3544, -4347, 5202, -6059, 6838, -7420, 7633, -7238, 5911, -3226, -1365, 8552, -19190, 34320, -55189, 83266, -120254, 168094, -228958 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..500

FORMULA

G.f.: exp(-Sum_{k>=1} x^k * Sum_{d|k} 1/(d*(1+x)^d)).

PROG

(PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, 1-x^k/(1+x)))

(PARI) N=66; x='x+O('x^N); Vec(exp(-sum(k=1, N, x^k*sumdiv(k, d, 1/(d*(1+x)^d)))))

CROSSREFS

Cf. A126348, A307599, A307602.

Sequence in context: A238485 A316264 A067744 * A194215 A025718 A022783

Adjacent sequences:  A307598 A307599 A307600 * A307602 A307603 A307604

KEYWORD

sign,look,changed

AUTHOR

Seiichi Manyama, Apr 18 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 21 23:55 EDT 2019. Contains 327286 sequences. (Running on oeis4.)