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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.

A216785 Number of unlabeled graphs on n nodes that have exactly two non-isomorphic components.

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 8
6 28
7 145
8 1022
9 12320
10 274785
11 12007355
12 1019030127
13 165091859656
14 50502058491413
15 29054157815353374
16 31426486309136268658
17 64001015806929213894372
18 245935864212056913811498454
19 1787577725208700551275529005084
20 24637809253253259917745389824933448

List of values

[0, 0, 1, 2, 8, 28, 145, 1022, 12320, 274785, 12007355, 1019030127, 165091859656, 50502058491413, 29054157815353374, 31426486309136268658, 64001015806929213894372, 245935864212056913811498454, 1787577725208700551275529005084, 24637809253253259917745389824933448]

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

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