OFFSET
1,10
LINKS
Peter Steinbach, Golden fields: a case for the heptagon, Math. Mag. Vol. 70, No. 1, Feb. 1997, 22-31.
Index entries for linear recurrences with constant coefficients, signature (1,6,-5,-10,6,4,-1).
FORMULA
a(0)=1, a(1)=a(2)=a(3)=a(4)=a(5)=a(6)=0; for n>6, a(n) = a(n-1) + 6*a(n-2) - 5*a(n-3) - 10*a(n-4) + 6*a(n-5) + 4*a(n-6) - a(n-7). - Harvey P. Dale, May 02 2011
G.f.: -x*(2*x-1)*(2*x^2-1)*(x^3+2*x^2-x-1)/((x-1)*(x^2+x-1)*(x^4-4*x^3-4*x^2+x+1)). - Colin Barker, Nov 08 2012
MATHEMATICA
LinearRecurrence[{1, 6, -5, -10, 6, 4, -1}, {1, 0, 0, 0, 0, 0, 0}, 60] (* Harvey P. Dale, May 02 2011 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Roger L. Bagula and Gary W. Adamson, Sep 20 2006
EXTENSIONS
Edited by N. J. A. Sloane, Feb 11 2007
Definition changed using Barker's g.f. by Bruno Berselli, Sep 19 2017
STATUS
approved