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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.

A215852 Number of simple labeled graphs on n nodes with exactly 2 connected components that are trees or cycles.

Table of values

n a(n)
2 1
3 3
4 19
5 135
6 1267
7 15029
8 218627
9 3783582
10 75956664
11 1734309929
12 44357222772
13 1255715827483
14 38971877812380
15 1315634598619830
16 47994245894462576
17 1881406032047006812
18 78870928008704884848
19 3520953336130828001295
20 166762291211479030734580

List of values

[1, 3, 19, 135, 1267, 15029, 218627, 3783582, 75956664, 1734309929, 44357222772, 1255715827483, 38971877812380, 1315634598619830, 47994245894462576, 1881406032047006812, 78870928008704884848, 3520953336130828001295, 166762291211479030734580]

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

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