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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.

A355108 Maximal number of root ancestral configurations among matching gene trees and species trees with n leaves.

Table of values

n a(n)
1 0
2 1
3 2
4 4
5 6
6 10
7 15
8 25
9 35
10 55
11 80
12 130
13 182
14 286
15 416
16 676
17 936
18 1456
19 2106
20 3406
21 4758
22 7462
23 10842
24 17602
25 24372
26 37912
27 54837
28 88687
29 123891
30 194299
31 282309
32 458329
33 634349
34 986389
35 1426439
36 2306539
37 3221843
38 5052451
39 7340711
40 11917231
41 16500521

List of values

[0, 1, 2, 4, 6, 10, 15, 25, 35, 55, 80, 130, 182, 286, 416, 676, 936, 1456, 2106, 3406, 4758, 7462, 10842, 17602, 24372, 37912, 54837, 88687, 123891, 194299, 282309, 458329, 634349, 986389, 1426439, 2306539, 3221843, 5052451, 7340711, 11917231, 16500521]

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

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