|
Search: id:A143098
|
|
| |
|
| 1, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1, 2, 2, -1
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Binomial transform = A143100: (1, 3, 4, 6, 13, 30, 64,...).
|
|
FORMULA
|
G.f.: x(1+2x-x^2+x^3)/((1-x)(1+x+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 06 2008]
a(n)=(1/3)*{-2*(n mod 3)+4*[(n+1) mod 3]+[(n+2) mod 3]}-[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Sep 29 2008]
|
|
CROSSREFS
|
Cf. A143097, A143100.
Sequence in context: A166332 A022303 A113189 this_sequence A114284 A023575 A105446
Adjacent sequences: A143095 A143096 A143097 this_sequence A143099 A143100 A143101
|
|
KEYWORD
|
sign
|
|
AUTHOR
|
Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 24 2008
|
|
|
Search completed in 0.002 seconds
|
