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A162809
Number of reduced words of length n in Coxeter group on 23 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.
0
1, 23, 506, 10879, 233772, 5020785, 107832648, 2315920761, 49739020254, 1068244419627, 22942674541710, 492739584509403, 10582562979139536, 227281596017492709, 4881324494907605052, 104836155861245820165
OFFSET
0,2
COMMENTS
The initial terms coincide with those of A170742, although the two sequences are eventually different.
Computed with MAGMA using commands similar to those used to compute A154638.
FORMULA
G.f.: (t^3 + 2*t^2 + 2*t + 1)/(231*t^3 - 21*t^2 - 21*t + 1)
CROSSREFS
Sequence in context: A218715 A133283 A121903 * A212336 A163171 A163518
KEYWORD
nonn
AUTHOR
John Cannon and N. J. A. Sloane, Dec 03 2009
STATUS
approved