OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1, 2).
FORMULA
a(n)+a(n+1) = -A000079(n-1), n>0.
a(n+1) = 4*(-1)^(n+1)- A154879(n).
G.f.: (1-3*x)*(2-3*x)/((1+x)*(1-2*x)). a(n) = -2^n/6+20*(-1)^n/3, n>0. - R. J. Mathar, Feb 25 2009
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Feb 10 2009
EXTENSIONS
Edited by R. J. Mathar, Feb 25 2009
STATUS
approved