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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.

A058877 Number of labeled acyclic digraphs with n nodes containing exactly n-1 points of in-degree zero.

Table of values

n a(n)
1 0
2 2
3 9
4 28
5 75
6 186
7 441
8 1016
9 2295
10 5110
11 11253
12 24564
13 53235
14 114674
15 245745
16 524272
17 1114095
18 2359278
19 4980717
20 10485740
21 22020075
22 46137322
23 96468969
24 201326568
25 419430375
26 872415206
27 1811939301
28 3758096356
29 7784628195
30 16106127330
31 33285996513

List of values

[0, 2, 9, 28, 75, 186, 441, 1016, 2295, 5110, 11253, 24564, 53235, 114674, 245745, 524272, 1114095, 2359278, 4980717, 10485740, 22020075, 46137322, 96468969, 201326568, 419430375, 872415206, 1811939301, 3758096356, 7784628195, 16106127330, 33285996513]

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

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