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.

A220232 Number of rooted labeled trees of height 2 such that every leaf is at a distance 2 from the root.

Table of values

n a(n)
0 0
1 0
2 0
3 6
4 12
5 80
6 390
7 2352
8 15176
9 106416
10 801450
11 6446000
12 55056012
13 497109912
14 4726554014
15 47164460280
16 492470203920
17 5366715030752
18 60896862950994
19 718023996605664
20 8780720796483860
21 111182108454527880
22 1455411630641384262
23 19668592336395304808

List of values

[0, 0, 0, 6, 12, 80, 390, 2352, 15176, 106416, 801450, 6446000, 55056012, 497109912, 4726554014, 47164460280, 492470203920, 5366715030752, 60896862950994, 718023996605664, 8780720796483860, 111182108454527880, 1455411630641384262, 19668592336395304808]

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

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