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A162767 Number of reduced words of length n in Coxeter group on 12 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I. 0
1, 12, 132, 1386, 14520, 151800, 1586970, 16589100, 173411700, 1812724650, 18948963000, 198079233000, 2070582104250, 21644420407500, 226255667302500, 2365118861366250, 24723302164275000, 258440148554775000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
The initial terms coincide with those of A003954, although the two sequences are eventually different.
Computed with MAGMA using commands similar to those used to compute A154638.
LINKS
FORMULA
G.f.: (t^3 + 2*t^2 + 2*t + 1)/(55*t^3 - 10*t^2 - 10*t + 1)
CROSSREFS
Sequence in context: A119237 A038729 A125447 * A003495 A324947 A165150
KEYWORD
nonn
AUTHOR
John Cannon and N. J. A. Sloane, Dec 03 2009
STATUS
approved

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Last modified February 29 01:59 EST 2024. Contains 370401 sequences. (Running on oeis4.)