OFFSET
1,1
COMMENTS
This sequence is the inverse permutation of A130508.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1).
FORMULA
a(n) = n - cos(2*n*Pi/3) + sqrt(3)*sin(2*n*Pi/3). - Wesley Ivan Hurt, Sep 26 2017
Sum_{n>=1} (-1)^n/a(n) = log(2)/3. - Amiram Eldar, Jan 31 2023
MATHEMATICA
LinearRecurrence[{1, 0, 1, -1}, {3, 1, 2, 6}, 100] (* Amiram Eldar, Jan 31 2023 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Jun 01 2007
STATUS
approved