OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).
FORMULA
a(n+5) = a(n) with a(0) = 1, a(2) = a(3) = a(4) = 0 and a(2) = 4.
O.g.f: (1+4z^2)/(1-z^5).
a(n) = 1-2/5*5^(1/2)*cos(2*n*Pi/5)+2/5*2^(1/2)*(5-5^(1/2))^(1/2)*sin(2*n*Pi/5) + 2/5*5^(1/2)*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
AUTHOR
Richard Choulet, Dec 14 2008
EXTENSIONS
More terms from Philippe Deléham, Dec 29 2008
STATUS
approved