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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.

A289991 Number of unlabeled connected simple graphs with n nodes of degree 4 or less and with at least a cyclic structure and a node of degree one.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 7
6 35
7 181
8 1027
9 6551
10 47356
11 383353
12 3439508
13 33796286
14 360254030
15 4132780425
16 50700507116
17 661702767423
18 9148018231984
19 133481943863634
20 2049205561735698
21 33008193951255524
22 556509843849858317
23 9799223447550907197
24 179855583136712491494

List of values

[0, 0, 0, 1, 7, 35, 181, 1027, 6551, 47356, 383353, 3439508, 33796286, 360254030, 4132780425, 50700507116, 661702767423, 9148018231984, 133481943863634, 2049205561735698, 33008193951255524, 556509843849858317, 9799223447550907197, 179855583136712491494]

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

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