OFFSET
0,2
REFERENCES
N. Bourbaki, Groupes et Algèbres de Lie, Chap. 4, 5 and 6, Hermann, Paris, 1968. See Chap. VI, Section 4, Problem 10b, page 231, W_a(t).
LINKS
Ray Chandler, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (7, -21, 34, -28, -1, 34, -48, 34, -1, -28, 35, -28, 29, -42, 49, -33, -5, 42, -46, 8, 43, -66, 43, 7, -39, 21, 29, -62, 55, -30, 22, -44, 74, -71, 18, 52, -84, 52, 18, -71, 74, -44, 22, -30, 55, -62, 29, 21, -39, 7, 43, -66, 43, 8, -46, 42, -5, -33, 49, -42, 29, -28, 35, -28, -1, 34, -48, 34, -1, -28, 34, -21, 7, -1).
FORMULA
The growth series for the affine Coxeter group of type B_k (k >= 2) has g.f. = Product_i (1-x^{m_i+1})/((1-x)*(1-x^{m_i})) where the m_i are [1,3,5,...,2k-1].
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 11 2016
STATUS
approved