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A162937 Number of reduced words of length n in Coxeter group on 6 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I. 0
1, 6, 30, 150, 735, 3600, 17640, 86400, 423210, 2073000, 10154040, 49737000, 243624060, 1193330400, 5845225440, 28631349600, 140243381160, 686946520800, 3364832751840, 16481777119200, 80731791755760, 395444141299200 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
The initial terms coincide with those of A003948, although the two sequences are eventually different.
Computed with MAGMA using commands similar to those used to compute A154638.
LINKS
FORMULA
G.f.: (t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(10*t^4 - 4*t^3 - 4*t^2 - 4*t + 1)
CROSSREFS
Sequence in context: A157519 A075886 A001412 * A006818 A006819 A163317
KEYWORD
nonn
AUTHOR
John Cannon and N. J. A. Sloane, Dec 03 2009
STATUS
approved

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)