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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.

A215854 Number of simple labeled graphs on n nodes with exactly 4 connected components that are trees or cycles.

Table of values

n a(n)
4 1
5 10
6 125
7 1610
8 23597
9 394506
10 7533445
11 163190665
12 3971678359
13 107502644249
14 3205669601953
15 104435680520535
16 3690517248021753
17 140590728463023632
18 5743180320999041664
19 250423270549658253350
20 11608409727652016747176
21 570034426072900362961212

List of values

[1, 10, 125, 1610, 23597, 394506, 7533445, 163190665, 3971678359, 107502644249, 3205669601953, 104435680520535, 3690517248021753, 140590728463023632, 5743180320999041664, 250423270549658253350, 11608409727652016747176, 570034426072900362961212]

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

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