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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.

A020556 Number of oriented multigraphs on n labeled arcs (without loops).

Table of values

n a(n)
0 1
1 1
2 7
3 87
4 1657
5 43833
6 1515903
7 65766991
8 3473600465
9 218310229201
10 16035686850327
11 1356791248984295
12 130660110400259849
13 14177605780945123273
14 1718558016836289502159
15 230999008481288064430879
16 34208659263890939390952225
17 5549763869122023099520756513

List of values

[1, 1, 7, 87, 1657, 43833, 1515903, 65766991, 3473600465, 218310229201, 16035686850327, 1356791248984295, 130660110400259849, 14177605780945123273, 1718558016836289502159, 230999008481288064430879, 34208659263890939390952225, 5549763869122023099520756513]

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

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