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.

A055349 Triangle of labeled mobiles (circular rooted trees) with n nodes and k leaves.

Table of values

n a(n)
1 1
2 2
3 0
4 6
5 3
6 0
7 24
8 36
9 8
10 0
11 120
12 360
13 220
14 30
15 0
16 720
17 3600
18 4200
19 1500
20 144
21 0
22 5040
23 37800
24 71400
25 47250
26 11508
27 840
28 0
29 40320
30 423360
31 1176000
32 1234800
33 545664
34 98784
35 5760
36 0
37 362880
38 5080320
39 19474560
40 29635200
41 20469456
42 6618528
43 940896
44 45360
45 0

List of values

[1, 2, 0, 6, 3, 0, 24, 36, 8, 0, 120, 360, 220, 30, 0, 720, 3600, 4200, 1500, 144, 0, 5040, 37800, 71400, 47250, 11508, 840, 0, 40320, 423360, 1176000, 1234800, 545664, 98784, 5760, 0, 362880, 5080320, 19474560, 29635200, 20469456, 6618528, 940896, 45360, 0]

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

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