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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.

A020557 Number of oriented multigraphs on n labeled arcs (with loops).

Table of values

n a(n)
0 1
1 2
2 15
3 203
4 4140
5 115975
6 4213597
7 190899322
8 10480142147
9 682076806159
10 51724158235372
11 4506715738447323
12 445958869294805289
13 49631246523618756274
14 6160539404599934652455
15 846749014511809332450147
16 128064670049908713818925644

List of values

[1, 2, 15, 203, 4140, 115975, 4213597, 190899322, 10480142147, 682076806159, 51724158235372, 4506715738447323, 445958869294805289, 49631246523618756274, 6160539404599934652455, 846749014511809332450147, 128064670049908713818925644]

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

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