OFFSET
0,3
COMMENTS
First 3 terms of a sum studied by Ramanujan.
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
G. E. Andrews, Simplicity and surprise in Ramanujan's "Lost" Notebook, Amer. Math. Monthly, 104 (No. 10, Dec. 1997), 918-925.
Index entries for linear recurrences with constant coefficients, signature (1,1,0,0,-2,0,0,1,1,-1).
MATHEMATICA
LinearRecurrence[{1, 1, 0, 0, -2, 0, 0, 1, 1, -1}, {1, 1, 2, 3, 4, 6, 8, 10, 13, 16, 20}, 60] (* Harvey P. Dale, Mar 11 2019 *)
PROG
(PARI) Vec((1 - x^4 + x^5 - x^9 + x^10) / ((1 - x)^4*(1 + x)^2*(1 + x^2)*(1 + x + x^2)) + O(x^100)) \\ Colin Barker, Oct 02 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jun 14 2000
STATUS
approved