OFFSET
0,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,2,0,0,-1).
FORMULA
G.f.: (1+x)*(2-x+7*x^2-x^3+2*x^4)/(1-x^3)^2.
Sum_{n>=0} (-1)^(n+1)/a(n) = (2-sqrt(2))*Pi/8. - Amiram Eldar, Oct 08 2023
MATHEMATICA
Table[Sequence @@ {8*n+2, 2*n+1, 8*n+6}, {n, 0, 20}] (* Amiram Eldar, Oct 08 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Curtz, Nov 26 2010
STATUS
approved