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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.

A214198 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 4
5 12
6 36
7 116
8 384
9 1304
10 4504
11 15772
12 55832
13 199432
14 717816
15 2600680
16 9476800
17 34710000
18 127712560
19 471851180
20 1749864920
21 6511643720
22 24307501720
23 91000873560
24 341594374400
25 1285436348112
26 4848292800336
27 18325541062936
28 69405260675824
29 263353613108944
30 1001028051476656
31 3811242180811728
32 14533071892504448

List of values

[0, 0, 0, 2, 4, 12, 36, 116, 384, 1304, 4504, 15772, 55832, 199432, 717816, 2600680, 9476800, 34710000, 127712560, 471851180, 1749864920, 6511643720, 24307501720, 91000873560, 341594374400, 1285436348112, 4848292800336, 18325541062936, 69405260675824, 263353613108944, 1001028051476656, 3811242180811728, 14533071892504448]

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

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