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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.

A215853 Number of simple labeled graphs on n nodes with exactly 3 connected components that are trees or cycles.

Table of values

n a(n)
3 1
4 6
5 55
6 540
7 6412
8 90734
9 1515097
10 29368155
11 649910349
12 16178495157
13 447436384356
14 13607804913248
15 451277483034618
16 16204761730619392
17 626327433705523558
18 25924177756443661632
19 1144012780063556028591
20 53615833082093775740400
21 2659498185704802765924159

List of values

[1, 6, 55, 540, 6412, 90734, 1515097, 29368155, 649910349, 16178495157, 447436384356, 13607804913248, 451277483034618, 16204761730619392, 626327433705523558, 25924177756443661632, 1144012780063556028591, 53615833082093775740400, 2659498185704802765924159]

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

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