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.

A218691 Number of ways to paint some (possibly none or all) of the trees over all forests on n labeled nodes.

Table of values

n a(n)
0 1
1 2
2 6
3 26
4 156
5 1242
6 12616
7 158034
8 2372880
9 41725106
10 843126624
11 19277549898
12 492447987136
13 13907344659210
14 430397513894016
15 14487404695687298
16 527023721684738304
17 20605894357093102434
18 861761850029367846400
19 38387125875316048363386
20 1814541564588778500135936

List of values

[1, 2, 6, 26, 156, 1242, 12616, 158034, 2372880, 41725106, 843126624, 19277549898, 492447987136, 13907344659210, 430397513894016, 14487404695687298, 527023721684738304, 20605894357093102434, 861761850029367846400, 38387125875316048363386, 1814541564588778500135936]

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

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