OFFSET
1,2
LINKS
F. Miller Maley et al., Symplectic packings in cotangent bundles of tori, Experimental Mathematics, 9 (No. 3, 2000), 435-455.
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
From Colin Barker, Nov 06 2019: (Start)
G.f.: x*(1 + 2*x - 3*x^2 + 21*x^4 - 21*x^5 + 39*x^6 + 186*x^7 - 505*x^8 + 281*x^9) / (1 - x)^2.
a(n) = 2*a(n-1) - a(n-2) for n>10.
a(n) = n for n>8.
(End)
EXAMPLE
1, 1/4, 1/4, 1/4, 4/25, 4/25, 9/64, 36/289, 1/9, 1/10, ...
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
N. J. A. Sloane, Feb 24 2001
EXTENSIONS
Edited by N. J. A. Sloane, May 23 2014
STATUS
approved