OFFSET
0,2
LINKS
FORMULA
a(n) = 5*[1-(-1)^n] = 10*(n mod 2). - Paolo P. Lava, Oct 20 2006
G.f.: 10x/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011
MATHEMATICA
PadRight[{}, 120, {0, 10}] (* Harvey P. Dale, Jan 15 2016 *)
PROG
(PARI) a(n)=n%2*10 \\ Charles R Greathouse IV, Jul 13 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved