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.

A339648 Number of series reduced trees with n nodes and integer labeled leaves covering an initial interval of positive integers.

Table of values

n a(n)
1 1
2 0
3 2
4 4
5 16
6 62
7 290
8 1496
9 8548
10 53278
11 359076
12 2597052
13 20034252
14 163996372
15 1418326160
16 12911494594
17 123317867572
18 1232219079760
19 12848961783474
20 139505358593240
21 1573914932077692
22 18418287165450500
23 223191801317514104
24 2796501582165674166
25 36179439053130339742

List of values

[1, 0, 2, 4, 16, 62, 290, 1496, 8548, 53278, 359076, 2597052, 20034252, 163996372, 1418326160, 12911494594, 123317867572, 1232219079760, 12848961783474, 139505358593240, 1573914932077692, 18418287165450500, 223191801317514104, 2796501582165674166, 36179439053130339742]

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

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