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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.

A217201 Number of simple unlabeled graphs with n nodes of 2 colors whose components are cycles.

Table of values

n a(n)
0 1
1 0
2 0
3 4
4 6
5 8
6 23
7 42
8 83
9 166
10 324
11 622
12 1236
13 2366
14 4595
15 8900
16 17225
17 33212
18 64376
19 124360
20 240819
21 466284
22 904149
23 1753782
24 3407225
25 6623274
26 12892131
27 25116456
28 48987833
29 95633480
30 186891367
31 365549578
32 715661254
33 1402246154
34 2749778317
35 5396266284

List of values

[1, 0, 0, 4, 6, 8, 23, 42, 83, 166, 324, 622, 1236, 2366, 4595, 8900, 17225, 33212, 64376, 124360, 240819, 466284, 904149, 1753782, 3407225, 6623274, 12892131, 25116456, 48987833, 95633480, 186891367, 365549578, 715661254, 1402246154, 2749778317, 5396266284]

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

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