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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.

A218688 Number of ways to linearly arrange the trees over all forests on n labeled nodes.

Table of values

n a(n)
0 1
1 1
2 3
3 15
4 106
5 975
6 11106
7 151501
8 2415960
9 44221869
10 915826600
11 21211128411
12 544126606992
13 15334985416075
14 471495297242256
15 15719617534811625
16 565271886957356416
17 21820620411482896089
18 900398349688515500160
19 39564926462522623540519
20 1845034125763359894240000

List of values

[1, 1, 3, 15, 106, 975, 11106, 151501, 2415960, 44221869, 915826600, 21211128411, 544126606992, 15334985416075, 471495297242256, 15719617534811625, 565271886957356416, 21820620411482896089, 900398349688515500160, 39564926462522623540519, 1845034125763359894240000]

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

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