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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.

A290778 Number of connected undirected unlabeled loopless multigraphs with 4 vertices and n edges.

Table of values

n a(n)
0 0
1 0
2 0
3 2
4 5
5 11
6 22
7 37
8 61
9 95
10 141
11 203
12 288
13 393
14 531
15 704
16 918
17 1180
18 1504
19 1887
20 2351
21 2900
22 3546
23 4301
24 5187
25 6202
26 7379
27 8726
28 10262
29 12005
30 13987
31 16209
32 18716
33 21521
34 24652
35 28135
36 32013
37 36291
38 41028
39 46244
40 51977
41 58262
42 65155
43 72667
44 80872
45 89798

List of values

[0, 0, 0, 2, 5, 11, 22, 37, 61, 95, 141, 203, 288, 393, 531, 704, 918, 1180, 1504, 1887, 2351, 2900, 3546, 4301, 5187, 6202, 7379, 8726, 10262, 12005, 13987, 16209, 18716, 21521, 24652, 28135, 32013, 36291, 41028, 46244, 51977, 58262, 65155, 72667, 80872, 89798]

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

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