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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.

A320064 The number of F_2 graphs on { 1, 2, ..., n } with a unique cycle of weight 1, which corresponds to the number of reflectable bases of the root system of type D_n.

Table of values

n a(n)
1 0
2 1
3 16
4 312
5 7552
6 220800
7 7597824
8 301321216
9 13545271296
10 681015214080
11 37879390720000
12 2309968030334976
13 153275504883695616
14 10995166075754119168
15 847974316241667686400
16 69971459959477921382400
17 6151490510604350965940224
18 574035430519008722436489216
19 56669921387839814123670994944

List of values

[0, 1, 16, 312, 7552, 220800, 7597824, 301321216, 13545271296, 681015214080, 37879390720000, 2309968030334976, 153275504883695616, 10995166075754119168, 847974316241667686400, 69971459959477921382400, 6151490510604350965940224, 574035430519008722436489216, 56669921387839814123670994944]

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

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