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.

A163145 Number of reduced words of length n in Coxeter group on 21 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.

Table of values

n a(n)
0 1
1 21
2 420
3 8400
4 167790
5 3351600
6 66948210
7 1337288400
8 26712295890
9 533577313500
10 10658190898110
11 212897044846500
12 4252612111884990
13 84945799915397400
14 1696789816099808010
15 33893325895893882600
16 677018172425014524090
17 13523417772619230573300

List of values

[1, 21, 420, 8400, 167790, 3351600, 66948210, 1337288400, 26712295890, 533577313500, 10658190898110, 212897044846500, 4252612111884990, 84945799915397400, 1696789816099808010, 33893325895893882600, 677018172425014524090, 13523417772619230573300]

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

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