Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
0,1
Table of n, a(n) for n=0..65.
Index entries for linear recurrences with constant coefficients, signature (0,1)
a(n)=-5/2*(-1)^n+15/2 =10*(n mod 2)+5*[(n+1) mod 2] - Paolo P. Lava, Oct 27 2006
G.f.: 5(1+2x)/((1-x)(1+x)). a(n)=5*A000034(n). [From R. J. Mathar, Oct 20 2008]
(PARI) a(n)=n%2*5+5 \\ Charles R Greathouse IV, Jul 13 2016
Cf. A176325.
Sequence in context: A276652 A137404 A110643 * A046795 A229793 A205854
Adjacent sequences: A010718 A010719 A010720 * A010722 A010723 A010724
nonn,easy
N. J. A. Sloane.
approved