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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.

A304386 Number of unlabeled hypertrees (connected antichains with no cycles) spanning up to n vertices and allowing singleton edges.

Table of values

n a(n)
0 1
1 2
2 5
3 15
4 50
5 200
6 907
7 4607
8 25077
9 144337
10 863678
11 5329994
12 33697112
13 217317986
14 1424880997
15 9474795661
16 63769947778
17 433751273356
18 2977769238994
19 20611559781972
20 143720352656500
21 1008765712435162
22 7122806053951140
23 50566532826530292
24 360761703055959592

List of values

[1, 2, 5, 15, 50, 200, 907, 4607, 25077, 144337, 863678, 5329994, 33697112, 217317986, 1424880997, 9474795661, 63769947778, 433751273356, 2977769238994, 20611559781972, 143720352656500, 1008765712435162, 7122806053951140, 50566532826530292, 360761703055959592]

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

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