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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.

A053419 Number of graphs with loops (symmetric relations) with n edges.

Table of values

n a(n)
0 1
1 2
2 5
3 14
4 38
5 107
6 318
7 972
8 3111
9 10410
10 36371
11 132656
12 504636
13 1998361
14 8224448
15 35112342
16 155211522
17 709123787
18 3342875421
19 16234342515
20 81102926848
21 416244824068
22 2192018373522
23 11831511359378
24 65387590986455
25 369661585869273
26 2135966349269550
27 12604385044890628

List of values

[1, 2, 5, 14, 38, 107, 318, 972, 3111, 10410, 36371, 132656, 504636, 1998361, 8224448, 35112342, 155211522, 709123787, 3342875421, 16234342515, 81102926848, 416244824068, 2192018373522, 11831511359378, 65387590986455, 369661585869273, 2135966349269550, 12604385044890628]

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

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