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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.

A001137 Number of black-rooted red-black trees with n internal nodes.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 8
6 16
7 33
8 56
9 90
10 164
11 330
12 688
13 1440
14 3008
15 6291
16 13168
17 27604
18 57896
19 120730
20 248312
21 501464
22 995664
23 1954582
24 3821328
25 7495996
26 14848472
27 29815976
28 60741680
29 125363472
30 261452256
31 549461078
32 1160693056
33 2459679936
34 5221717888

List of values

[1, 2, 2, 4, 8, 16, 33, 56, 90, 164, 330, 688, 1440, 3008, 6291, 13168, 27604, 57896, 120730, 248312, 501464, 995664, 1954582, 3821328, 7495996, 14848472, 29815976, 60741680, 125363472, 261452256, 549461078, 1160693056, 2459679936, 5221717888]

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

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