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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.

A071213 Number of labeled planar trees with n nodes such that the root is smaller than all its children.

Table of values

n a(n)
2 1
3 4
4 34
5 436
6 7428
7 157368
8 3980688
9 116949600
10 3911421600
11 146673662400
12 6093249563520
13 277729608280320
14 13778539159795200
15 739059210587980800
16 42615627311477606400
17 2628646012982829772800
18 172704619437756321484800

List of values

[1, 4, 34, 436, 7428, 157368, 3980688, 116949600, 3911421600, 146673662400, 6093249563520, 277729608280320, 13778539159795200, 739059210587980800, 42615627311477606400, 2628646012982829772800, 172704619437756321484800]

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

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