OFFSET
0,1
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
J. Riordan, The distribution of crossings of chords joining pairs of 2n points on a circle, Math. Comp., 29 (1975), 215-222.
J. Riordan, The distribution of crossings of chords joining pairs of 2n points on a circle, Math. Comp., 29 (1975), 215-222. [Annotated scanned copy]
Index entries for linear recurrences with constant coefficients, signature (4,-8,4,-1).
FORMULA
G.f.: -(x^3-3*x^2+6*x-2) / (x^4-4*x^3+8*x^2-4*x+1). - Colin Barker, Jul 09 2015
PROG
(PARI) Vec(-(x^3-3*x^2+6*x-2)/(x^4-4*x^3+8*x^2-4*x+1) + O(x^50)) \\ Colin Barker, Jul 09 2015
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Jul 08 2015
STATUS
approved