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.

A220829 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2], with each label used at least once.

Table of values

n a(n)
1 0
2 1
3 2
4 4
5 10
6 27
7 74
8 226
9 710
10 2354
11 8010
12 28189
13 101094
14 370119
15 1375198
16 5181003
17 19740940
18 75990173
19 295100800
20 1155106357
21 4553312866
22 18063117153
23 72069297826
24 289053128879
25 1164870009786
26 4714970819402
27 19161572076550
28 78162885020942
29 319940035684684
30 1313799822309748

List of values

[0, 1, 2, 4, 10, 27, 74, 226, 710, 2354, 8010, 28189, 101094, 370119, 1375198, 5181003, 19740940, 75990173, 295100800, 1155106357, 4553312866, 18063117153, 72069297826, 289053128879, 1164870009786, 4714970819402, 19161572076550, 78162885020942, 319940035684684, 1313799822309748]

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

Content is available under The OEIS End-User License Agreement.