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.

A245121 Number of n-node rooted identity trees with thinning limbs and root outdegree (branching factor) 2.

Table of values

n a(n)
4 1
5 1
6 3
7 4
8 8
9 12
10 22
11 36
12 63
13 107
14 188
15 327
16 578
17 1020
18 1820
19 3248
20 5839
21 10511
22 19022
23 34484
24 62755
25 114421
26 209234
27 383327
28 703901
29 1294822
30 2386376
31 4405083
32 8144701
33 15080416
34 27961728
35 51912054
36 96496481
37 179577543
38 334558479
39 623936240
40 1164765120

List of values

[1, 1, 3, 4, 8, 12, 22, 36, 63, 107, 188, 327, 578, 1020, 1820, 3248, 5839, 10511, 19022, 34484, 62755, 114421, 209234, 383327, 703901, 1294822, 2386376, 4405083, 8144701, 15080416, 27961728, 51912054, 96496481, 179577543, 334558479, 623936240, 1164765120]

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

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