cp's OEIS Frontend

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.

A292229 Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes such that the maximum of the node outdegrees equals three.

Table of values

n a(n)
3 1
4 2
5 6
6 17
7 47
8 133
9 380
10 1096
11 3186
12 9351
13 27618
14 82168
15 245882
16 740003
17 2238186
18 6801375
19 20754977
20 63583715
21 195486605
22 603003882
23 1865692570
24 5788676649
25 18007192835
26 56151236196
27 175486946089
28 549586009252
29 1724530420457
30 5421195811358
31 17070958403725

List of values

[1, 2, 6, 17, 47, 133, 380, 1096, 3186, 9351, 27618, 82168, 245882, 740003, 2238186, 6801375, 20754977, 63583715, 195486605, 603003882, 1865692570, 5788676649, 18007192835, 56151236196, 175486946089, 549586009252, 1724530420457, 5421195811358, 17070958403725]

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

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