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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.

A168778 Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^19 = I.

Table of values

n a(n)
0 1
1 5
2 20
3 80
4 320
5 1280
6 5120
7 20480
8 81920
9 327680
10 1310720
11 5242880
12 20971520
13 83886080
14 335544320
15 1342177280
16 5368709120
17 21474836480
18 85899345920
19 343597383670
20 1374389534640
21 5497558138410
22 21990232553040
23 87960930209760

List of values

[1, 5, 20, 80, 320, 1280, 5120, 20480, 81920, 327680, 1310720, 5242880, 20971520, 83886080, 335544320, 1342177280, 5368709120, 21474836480, 85899345920, 343597383670, 1374389534640, 5497558138410, 21990232553040, 87960930209760]

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

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