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.

A197131 Sum of the reflection (absolute) lengths of all elements in the Coxeter group of type D_n.

Table of values

n a(n)
2 4
3 46
4 544
5 7216
6 108096
7 1816704
8 33951744
9 699512832
10 15765626880
11 386046443520
12 10208951009280
13 290039357767680
14 8811722692362240
15 285113464809062400
16 9789232245217689600
17 355501479519741542400
18 13615286053738276454400
19 548476851979845579571200

List of values

[4, 46, 544, 7216, 108096, 1816704, 33951744, 699512832, 15765626880, 386046443520, 10208951009280, 290039357767680, 8811722692362240, 285113464809062400, 9789232245217689600, 355501479519741542400, 13615286053738276454400, 548476851979845579571200]

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

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