OFFSET
1,2
COMMENTS
LINKS
Peter Kagey, Table of n, a(n) for n = 1..10003
FORMULA
Conjectures from Colin Barker, Aug 05 2016: (Start)
a(n) = 2*a(n-1)-a(n-2)+a(n-6)-2*a(n-7)+a(n-8) for n>8.
G.f.: x*(1-x^6+x^7) / ((1-x)^3*(1+x)*(1-x+x^2)*(1+x+x^2)).
(End)
Conjecture: a(n) = (n+4-3*floor((n+4)/6)-2)*floor((n+4)/6)+1. - Luce ETIENNE, May 25 2017
PROG
(Haskell)
a275673 n = a275673_list !! (n - 1)
a275673_list = scanl (+) 1 $ concatMap (replicate 6) [1..]
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Kagey, Aug 04 2016
STATUS
approved