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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.

A339784 Number of homeomorphically irreducible leaf colored trees with n leaves of 4 colors.

Table of values

n a(n)
0 1
1 4
2 10
3 20
4 90
5 476
6 3034
7 21380
8 163670
9 1322960
10 11156014
11 97142260
12 868031736
13 7921646244
14 73577937258
15 693691932892
16 6624644271386
17 63974219412076
18 623878427017208
19 6137012579638796
20 60836810198042200
21 607270688878149596
22 6099719973597772370

List of values

[1, 4, 10, 20, 90, 476, 3034, 21380, 163670, 1322960, 11156014, 97142260, 868031736, 7921646244, 73577937258, 693691932892, 6624644271386, 63974219412076, 623878427017208, 6137012579638796, 60836810198042200, 607270688878149596, 6099719973597772370]

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

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