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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.

A214201 Number of rooted planar binary unlabeled trees with n leaves and caterpillar index >= 4.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 4
5 8
6 24
7 80
8 264
9 912
10 3216
11 11488
12 41528
13 151408
14 555792
15 2051808
16 7610384
17 28341536
18 105914784
19 397028544
20 1492351576
21 5623204528
22 21235347856
23 80355038176
24 304630332528
25 1156851587552
26 4400205758176
27 16761475403328
28 63937267846704
29 244209062245984
30 933904716768672
31 3575584117620416
32 13704666128328736
33 52582688861676096

List of values

[0, 0, 0, 0, 4, 8, 24, 80, 264, 912, 3216, 11488, 41528, 151408, 555792, 2051808, 7610384, 28341536, 105914784, 397028544, 1492351576, 5623204528, 21235347856, 80355038176, 304630332528, 1156851587552, 4400205758176, 16761475403328, 63937267846704, 244209062245984, 933904716768672, 3575584117620416, 13704666128328736, 52582688861676096]

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

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