OFFSET
0,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).
FORMULA
a(n+5) = a(n).
G.f: (4+z+4*z^2+z^4)/(1-z^5).
a(n) = 2+(-1/5*5^(1/2)+1)*cos(2*n*Pi/5)+(2/5*2^(1/2)*(5-5^(1/2))^(1/2))*sin(2*n*Pi/5)+(1/5*5^(1/2)+1)*cos(4*n*Pi/5)+(-2/5*2^(1/2)*(5+5^(1/2))^(1/2))*sin(4*n*Pi/5)
CROSSREFS
KEYWORD
easy,nonn,less
AUTHOR
Richard Choulet, Dec 14 2008
STATUS
approved