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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.

A121252 Number of labeled digraphs without isolated vertices and with n arcs.

Table of values

n a(n)
0 1
1 2
2 25
3 520
4 15150
5 567540
6 25986334
7 1406214816
8 87803248260
9 6213408758960
10 491423381371208
11 42958461746823376
12 4112928296979824348
13 428022362222941505760
14 48106759414197240877200
15 5807382441785322296139392

List of values

[1, 2, 25, 520, 15150, 567540, 25986334, 1406214816, 87803248260, 6213408758960, 491423381371208, 42958461746823376, 4112928296979824348, 428022362222941505760, 48106759414197240877200, 5807382441785322296139392]

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

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