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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.

A222006 Number of forests of rooted plane binary trees (all nodes have outdegree of 0 or 2) with n total nodes.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 4
6 5
7 10
8 12
9 27
10 35
11 79
12 104
13 244
14 331
15 789
16 1083
17 2615
18 3652
19 8880
20 12523
21 30657
22 43661
23 107326
24 153985
25 379945
26 548776
27 1357922
28 1972153
29 4892140
30 7139850
31 17747863
32 26011843
33 64776658
34 95296413
35 237689691
36 350844814
37 876313458
38 1297367201
39 3244521203
40 4816399289

List of values

[1, 1, 1, 2, 2, 4, 5, 10, 12, 27, 35, 79, 104, 244, 331, 789, 1083, 2615, 3652, 8880, 12523, 30657, 43661, 107326, 153985, 379945, 548776, 1357922, 1972153, 4892140, 7139850, 17747863, 26011843, 64776658, 95296413, 237689691, 350844814, 876313458, 1297367201, 3244521203, 4816399289]

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

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