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.

A011270 Hybrid binary rooted trees with n nodes whose root is labeled by "n".

Table of values

n a(n)
0 1
1 1
2 4
3 18
4 90
5 481
6 2690
7 15547
8 92124
9 556664
10 3417062
11 21248966
12 133576724
13 847465593
14 5419399722
15 34895368578
16 226050057378
17 1472170887755
18 9633297762870
19 63305402213336
20 417612181048826
21 2764492667188504
22 18358282050480384
23 122265756020847943

List of values

[1, 1, 4, 18, 90, 481, 2690, 15547, 92124, 556664, 3417062, 21248966, 133576724, 847465593, 5419399722, 34895368578, 226050057378, 1472170887755, 9633297762870, 63305402213336, 417612181048826, 2764492667188504, 18358282050480384, 122265756020847943]

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

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