OFFSET
1,2
REFERENCES
Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
LINKS
Colin Barker, Table of n, a(n) for n = 1..1000
R. C. Schroeppel, A few mathematical experiments
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
FORMULA
a(n) = 5*(n-1) + 305*C(n-1,2) + 1740*C(n-1,3) + 2000*C(n-1,4) where C(n,k) is the binomial coefficient. - Joshua Zucker, Aug 14 2006
a(n) = 5*(672-1715*n+1595*n^2-652*n^3+100*n^4)/6. - Colin Barker, Feb 28 2015
G.f.: -5*x^2*(112*x^3+229*x^2+58*x+1) / (x-1)^5. - Colin Barker, Feb 28 2015
PROG
(PARI) concat(0, Vec(-5*x^2*(112*x^3+229*x^2+58*x+1)/(x-1)^5 + O(x^100))) \\ Colin Barker, Feb 28 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 05 2004
EXTENSIONS
More terms from Joshua Zucker, Aug 14 2006
STATUS
approved