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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.

A121941 Number of unlabeled connected simple graphs with n nodes of degree 4 or less.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 6
5 21
6 78
7 353
8 1929
9 12207
10 89402
11 739335
12 6800637
13 68531618
14 748592936
15 8788983173
16 110201690911
17 1468157196474
18 20695559603921
19 307590282700915
20 4805537369573319
21 78710267083015571
22 1348394635886684901
23 24109112440149231355
24 449050443283294835914

List of values

[1, 1, 1, 2, 6, 21, 78, 353, 1929, 12207, 89402, 739335, 6800637, 68531618, 748592936, 8788983173, 110201690911, 1468157196474, 20695559603921, 307590282700915, 4805537369573319, 78710267083015571, 1348394635886684901, 24109112440149231355, 449050443283294835914]

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

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