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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.

A137975 Row sums of A139621, number of connected directed multigraphs with loops and no vertex of degree 0, with n arcs.

Table of values

n a(n)
0 1
1 2
2 8
3 32
4 167
5 928
6 5924
7 40211
8 293370
9 2255406
10 18201706
11 153176115
12 1339271815
13 12124484941
14 113362749476
15 1092329626380
16 10827837622018
17 110249198676581
18 1151562885666429
19 12324860339781102
20 135026515460855978
21 1512882677086123938
22 17321462912397361409
23 202503301170606347695
24 2415733704608822524946
25 29387239261415606708127

List of values

[1, 2, 8, 32, 167, 928, 5924, 40211, 293370, 2255406, 18201706, 153176115, 1339271815, 12124484941, 113362749476, 1092329626380, 10827837622018, 110249198676581, 1151562885666429, 12324860339781102, 135026515460855978, 1512882677086123938, 17321462912397361409, 202503301170606347695, 2415733704608822524946, 29387239261415606708127]

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

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