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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.

A323877 Number of labeled graphs on n nodes with four connected components.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 10
6 125
7 2275
8 64673
9 3102204
10 272277040
11 46202044900
12 15442093276764
13 10171924771814520
14 13188852179018387144
15 33674263441006260931040
16 169522275849148918884400912
17 1685048703908907788901122512512
18 33116110237646373502366665503208064
19 1288337109916947580133035603563656989952
20 99320901948403913391024993536094346775110656

List of values

[0, 0, 0, 1, 10, 125, 2275, 64673, 3102204, 272277040, 46202044900, 15442093276764, 10171924771814520, 13188852179018387144, 33674263441006260931040, 169522275849148918884400912, 1685048703908907788901122512512, 33116110237646373502366665503208064, 1288337109916947580133035603563656989952, 99320901948403913391024993536094346775110656]

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

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