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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.

A058837 Number of labeled n-node 4-valent graphs containing a loop and a double edge.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 30
6 360
7 12390
8 492240
9 24517080
10 1499961960
11 111400817220
12 9894176455680
13 1036335934435230
14 126455286914316360
15 17785504207015034490
16 2856590783311452576480
17 519670214181036892602720

List of values

[0, 0, 0, 0, 0, 30, 360, 12390, 492240, 24517080, 1499961960, 111400817220, 9894176455680, 1036335934435230, 126455286914316360, 17785504207015034490, 2856590783311452576480, 519670214181036892602720]

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

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