The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A168785

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A168785

Number of reduced words of length n in Coxeter group on 12 generators S_i with relations (S_i)^2 = (S_i S_j)^19 = I.
(history; published version)

#16 by Harvey P. Dale at Sat Dec 30 13:28:07 EST 2017

STATUS

editing

approved

#15 by Harvey P. Dale at Sat Dec 30 13:28:02 EST 2017

MATHEMATICA

coxG[{19, 55, -10}] (* The coxG program is at A169452 *) (* Harvey P. Dale, Dec 30 2017 *)

STATUS

approved

editing

#14 by Ray Chandler at Thu Nov 24 16:16:51 EST 2016

STATUS

editing

approved

#13 by Ray Chandler at Thu Nov 24 16:16:49 EST 2016

LINKS

<a href="/index/Rec#order_19">Index entries for linear recurrences with constant coefficients</a>, signature (10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, -55).

STATUS

approved

editing

#12 by Alois P. Heinz at Mon Aug 15 20:09:38 EDT 2016

STATUS

reviewed

approved

#11 by Michael De Vlieger at Mon Aug 15 16:57:15 EDT 2016

STATUS

proposed

reviewed

#10 by G. C. Greubel at Mon Aug 15 11:26:28 EDT 2016

STATUS

editing

proposed

#9 by G. C. Greubel at Mon Aug 15 11:26:21 EDT 2016

LINKS

G. C. Greubel, <a href="/A168785/b168785.txt">Table of n, a(n) for n = 0..500</a>

MATHEMATICA

CoefficientList[Series[(t^19 + 2*t^18 + 2*t^17 + 2*t^16 + 2*t^15 + 2*t^14 + 2*t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + 2*t^8 + 2*t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(55*t^19 - 10*t^18 - 10*t^17 - 10*t^16 - 10*t^15 - 10*t^14 - 10*t^13 - 10*t^12 - 10*t^11 - 10*t^10 - 10*t^9 - 10*t^8 - 10*t^7 - 10*t^6 - 10*t^5 - 10*t^4 - 10*t^3 - 10*t^2 - 10*t + 1), {t, 0, 50}], t] (* G. C. Greubel, Aug 15 2016 *)

STATUS

approved

editing

#8 by Bruno Berselli at Sat Aug 13 03:47:35 EDT 2016

STATUS

editing

approved

#7 by Bruno Berselli at Sat Aug 13 03:47:32 EDT 2016

COMMENTS

First disagreement at index 19: a(19) = 66719007761906777706, A003954(19) = 66719007761906777772. - _Klaus Brockhaus, _, Mar 30 2011

KEYWORD

nonn,easy,changed

STATUS

approved

editing