cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A163878 Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.

Table of values

n a(n)
0 1
1 5
2 20
3 80
4 320
5 1280
6 5110
7 20400
8 81450
9 325200
10 1298400
11 5184000
12 20697690
13 82637820
14 329940630
15 1317324420
16 5259563280
17 20999387520
18 83842374870
19 334749945240
20 1336526142210
21 5336228292840
22 21305481048360
23 85064487085440

List of values

[1, 5, 20, 80, 320, 1280, 5110, 20400, 81450, 325200, 1298400, 5184000, 20697690, 82637820, 329940630, 1317324420, 5259563280, 20999387520, 83842374870, 334749945240, 1336526142210, 5336228292840, 21305481048360, 85064487085440]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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