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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.

A369289 Number of connected graphs with loops (symmetric relations) on n unlabeled vertices with at most n edges.

Table of values

n a(n)
0 1
1 2
2 2
3 4
4 8
5 17
6 39
7 92
8 227
9 573
10 1482
11 3883
12 10343
13 27786
14 75392
15 205933
16 566166
17 1564316
18 4342431
19 12100382
20 33836606
21 94903889
22 266914438
23 752517020
24 2126292931
25 6020035120
26 17075411671
27 48514471709
28 138051863755
29 393397897262
30 1122523343690

List of values

[1, 2, 2, 4, 8, 17, 39, 92, 227, 573, 1482, 3883, 10343, 27786, 75392, 205933, 566166, 1564316, 4342431, 12100382, 33836606, 94903889, 266914438, 752517020, 2126292931, 6020035120, 17075411671, 48514471709, 138051863755, 393397897262, 1122523343690]

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

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