OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n=1..100
FORMULA
For n>6, a(n) = 7*a(n-1) - 11*a(n-2) + 6*a(n-3) + a(n-4) - 7*a(n-5) + a(n-6). [From Max Alekseyev, Aug 01 2009]
G.f.: -x*(x-1)*(x^2+3*x-1)/(-1+7*x-11*x^2+6*x^3+x^4-7*x^5+x^6). [From R. J. Mathar, Aug 11 2009]
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 20 2009
STATUS
approved