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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.

A001679 Number of series-reduced rooted trees with n nodes.

Table of values

n a(n)
0 1
1 1
2 1
3 0
4 2
5 2
6 4
7 6
8 12
9 20
10 39
11 71
12 137
13 261
14 511
15 995
16 1974
17 3915
18 7841
19 15749
20 31835
21 64540
22 131453
23 268498
24 550324
25 1130899
26 2330381
27 4813031
28 9963288
29 20665781
30 42947715
31 89410092
32 186447559
33 389397778
34 814447067
35 1705775653
36 3577169927

List of values

[1, 1, 1, 0, 2, 2, 4, 6, 12, 20, 39, 71, 137, 261, 511, 995, 1974, 3915, 7841, 15749, 31835, 64540, 131453, 268498, 550324, 1130899, 2330381, 4813031, 9963288, 20665781, 42947715, 89410092, 186447559, 389397778, 814447067, 1705775653, 3577169927]

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

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