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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.

A004111 Number of rooted identity trees with n nodes (rooted trees whose automorphism group is the identity group).

Table of values

n a(n)
0 0
1 1
2 1
3 1
4 2
5 3
6 6
7 12
8 25
9 52
10 113
11 247
12 548
13 1226
14 2770
15 6299
16 14426
17 33209
18 76851
19 178618
20 416848
21 976296
22 2294224
23 5407384
24 12780394
25 30283120
26 71924647
27 171196956
28 408310668
29 975662480
30 2335443077
31 5599508648
32 13446130438
33 32334837886
34 77863375126
35 187737500013
36 453203435319
37 1095295264857
38 2649957419351

List of values

[0, 1, 1, 1, 2, 3, 6, 12, 25, 52, 113, 247, 548, 1226, 2770, 6299, 14426, 33209, 76851, 178618, 416848, 976296, 2294224, 5407384, 12780394, 30283120, 71924647, 171196956, 408310668, 975662480, 2335443077, 5599508648, 13446130438, 32334837886, 77863375126, 187737500013, 453203435319, 1095295264857, 2649957419351]

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

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