OFFSET
0,1
LINKS
FORMULA
a(n+1) = 10*(-1)^n*A001045(n).
G.f.: 5*(1+x)/(1+x-2*x^2). - R. J. Mathar, Feb 23 2009
a(n) = (5*(2+(-2)^n))/3. - Colin Barker, Jun 10 2012
a(n) = -a(n-1) + 2*a(n-2) for n > 1. - Klaus Purath, Jan 30 2021
E.g.f.: 5*exp(-2*x)*(1 + 2*exp(3*x))/3. - Stefano Spezia, Jan 30 2021
MATHEMATICA
LinearRecurrence[{-1, 2}, {5, 0}, 32] (* Robert P. P. McKone, Jan 31 2021 *)
CROSSREFS
KEYWORD
sign,easy,less
AUTHOR
Paul Curtz, Feb 09 2009
EXTENSIONS
Edited and extended by R. J. Mathar Feb 23 2009
STATUS
approved