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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.

A036777 Number of labeled rooted trees with a degree constraint (described in the comments below).

Table of values

n a(n)
0 0
1 1
2 2
3 9
4 64
5 625
6 7776
7 117642
8 2096752
9 43030008
10 999357660
11 25912953990
12 742054808880
13 23259517076796
14 792084372215136
15 29120668067951460
16 1149560690861943360
17 48497162427675081120
18 2177517061087611122880
19 103677374170183264555104
20 5217647895920644618674240
21 276740347650892414464815640
22 15429120173129978156923361280
23 902095425530332280621924069520

List of values

[0, 1, 2, 9, 64, 625, 7776, 117642, 2096752, 43030008, 999357660, 25912953990, 742054808880, 23259517076796, 792084372215136, 29120668067951460, 1149560690861943360, 48497162427675081120, 2177517061087611122880, 103677374170183264555104, 5217647895920644618674240, 276740347650892414464815640, 15429120173129978156923361280, 902095425530332280621924069520]

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

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