OFFSET
3,1
LINKS
Fausto A. C. Cariboni, Table of n, a(n) for n = 3..111
Fausto A. C. Cariboni, Examples of cyclic arrangements for a(3)-a(111)
FORMULA
Conjectures from Colin Barker, Sep 10 2020: (Start)
G.f.: 3*x^3*(1 + x^6 + x^10 - x^12) / ((1 - x)^2*(1 + x)*(1 - x + x^2)*(1 + x + x^2)).
a(n) = a(n-1) + a(n-6) - a(n-7) for n>15.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
Fausto A. C. Cariboni, Sep 09 2020
STATUS
approved