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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.

A227808 Number of rooted identity trees with n nodes and exactly 4 subtrees from the root.

Table of values

n a(n)
11 2
12 4
13 13
14 34
15 91
16 225
17 571
18 1403
19 3466
20 8468
21 20703
22 50389
23 122673
24 298090
25 724433
26 1759595
27 4274819
28 10385533
29 25240007
30 61358410
31 149226407
32 363077813
33 883818374
34 2152462147
35 5244790003
36 12786162151
37 31187100089
38 76108058977
39 185825963102
40 453940832229

List of values

[2, 4, 13, 34, 91, 225, 571, 1403, 3466, 8468, 20703, 50389, 122673, 298090, 724433, 1759595, 4274819, 10385533, 25240007, 61358410, 149226407, 363077813, 883818374, 2152462147, 5244790003, 12786162151, 31187100089, 76108058977, 185825963102, 453940832229]

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

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