|
Search: id:A065490
|
|
|
| A065490 |
|
Exponents in expansion of constant A065463 as Product_{n>1} zeta(n)^(-a(n)). |
|
+0
2
|
|
| 0, 1, -1, 1, -2, 3, -4, 5, -8, 13, -18, 25, -40, 62, -90, 135, -210, 324, -492, 750, -1164, 1809, -2786, 4305, -6710, 10460, -16264, 25350, -39650, 62057, -97108, 152145, -238818, 375165, -589520, 927200, -1459960, 2300346, -3626200
(list; graph; listen)
|
|
|
OFFSET
|
1,5
|
|
|
COMMENT
|
The sequence 1,1,1,1,2,3,4,5,8,13,18,25,40,62,90,135,... appears in Lehrer-Segal on p. 285, in the following context: Let V=Sum_{k=1..infty} V_k be the graded vector space H_*(PC^infty)[1], which has Poincare series p(t)=t/(1-t^2). This sequence gives the dimensions of the free graded Lie algebra L on V.
Inverse Euler transform of F(1-n) where F() is Fibonacci numbers A000045. - Michael Somos, Jul 21 2003
|
|
REFERENCES
|
G. I. Lehrer and G. B. Segal, Homology stability for classical regular semisimple varieties, Math. Zeit., 236 (2001), 251-290.
|
|
LINKS
|
G. I. Lehrer, Some sequences arising at the interface of representation theory and homotopy theory
G. Niklasch, Some number theoretical constants: 1000-digit values
N. J. A. Sloane, Transforms
|
|
FORMULA
|
a(n) = (1/n)*Sum_{d|n} (-1)^d*mu(n/d)*(Fibonacci(d-1)+Fibonacci(d+1)-1). - Vladeta Jovovic (vladeta(AT)eunet.rs), May 03 2003
|
|
PROGRAM
|
(PARI) a(n)=if(n<1, 0, sumdiv(n, d, (-1)^d*moebius(n/d)*(fibonacci(d+1)+fibonacci(d-1)-1))/n)
|
|
CROSSREFS
|
Cf. A065463.
Sequence in context: A113439 A018059 A050024 this_sequence A051706 A152526 A162901
Adjacent sequences: A065487 A065488 A065489 this_sequence A065491 A065492 A065493
|
|
KEYWORD
|
sign
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2001
|
|
EXTENSIONS
|
More terms and formula from Christian G. Bower (bowerc(AT)usa.net), Aug 23 2002
|
|
|
Search completed in 0.002 seconds
|
