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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.

A344934 Number of rooted binary phylogenetic trees with n leaves and minimal Sackin tree balance index.

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 30
6 135
7 315
8 315
9 11340
10 198450
11 2182950
12 16372125
13 85135050
14 297972675
15 638512875
16 638512875
17 86837751000
18 5861548192500
19 259861969867500
20 8445514020693750
21 212826953321482500
22 4292010225316563750
23 70511596558772118750
24 951906553543423603125
25 10576739483815817812500
26 96248329302723942093750

List of values

[1, 1, 3, 3, 30, 135, 315, 315, 11340, 198450, 2182950, 16372125, 85135050, 297972675, 638512875, 638512875, 86837751000, 5861548192500, 259861969867500, 8445514020693750, 212826953321482500, 4292010225316563750, 70511596558772118750, 951906553543423603125, 10576739483815817812500, 96248329302723942093750]

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

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