OFFSET
1,1
COMMENTS
The exponents are 1, 4, 5, 7, 8, 11. The point of this sequence is that a similar generating function gives the exponents for any finite Coxeter group.
LINKS
FORMULA
G.f.: (1-x^8)*(1-x^9)/((1-x^3)*(1-x^4)).
MATHEMATICA
CoefficientList[Series[(1 - x^8) (1 - x^9)/((1 - x^3) (1 - x^4)), {x, 0, 11}], x] (* Michael De Vlieger, Oct 10 2017 *)
PROG
(Scheme) (define (A089012 n) (if (member n '(1 4 5 7 8 11)) 1 0)) ;; Antti Karttunen, Oct 10 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Boddington, Nov 03 2003
EXTENSIONS
More zeros from Antti Karttunen, Oct 10 2017
STATUS
approved