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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.

A322555 Number of labeled simple graphs on n vertices where all non-isolated vertices have the same degree.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 18
5 69
6 390
7 2703
8 59474
9 1548349
10 168926258
11 12165065351
12 7074423247562
13 2294426405580191
14 4218009215702391954
15 3810376434461484994317
16 35102248193591661086921250
17 156873334244228518638713087133
18 4144940994226400702145709978234154

List of values

[1, 1, 2, 5, 18, 69, 390, 2703, 59474, 1548349, 168926258, 12165065351, 7074423247562, 2294426405580191, 4218009215702391954, 3810376434461484994317, 35102248193591661086921250, 156873334244228518638713087133, 4144940994226400702145709978234154]

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

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