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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.

A214199 Number of rooted planar binary unlabeled trees with n leaves and caterpillar index = 3.

Table of values

n a(n)
0 0
1 0
2 0
3 2
4 0
5 4
6 12
7 36
8 120
9 392
10 1288
11 4284
12 14304
13 48024
14 162024
15 548872
16 1866416
17 6368464
18 21797776
19 74822636
20 257513344
21 888439192
22 3072153864
23 10645835384
24 36964041872
25 128584760560
26 448087042160
27 1564065659608
28 5467992829120
29 19144550862960
30 67123334707984
31 235658063191312
32 828405764175712
33 2915610778184352
34 10273466501139232
35 36239527330228044

List of values

[0, 0, 0, 2, 0, 4, 12, 36, 120, 392, 1288, 4284, 14304, 48024, 162024, 548872, 1866416, 6368464, 21797776, 74822636, 257513344, 888439192, 3072153864, 10645835384, 36964041872, 128584760560, 448087042160, 1564065659608, 5467992829120, 19144550862960, 67123334707984, 235658063191312, 828405764175712, 2915610778184352, 10273466501139232, 36239527330228044]

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

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