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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.

A329665 Number of meanders of length n with Motzkin-steps avoiding the consecutive steps UD, HH and DU.

Table of values

n a(n)
0 1
1 2
2 3
3 6
4 11
5 20
6 38
7 72
8 136
9 260
10 499
11 958
12 1847
13 3572
14 6917
15 13422
16 26097
17 50808
18 99049
19 193354
20 377857
21 739148
22 1447292
23 2836316
24 5562774
25 10918180
26 21444029
27 42143986
28 82874681
29 163060540
30 320996342
31 632211192
32 1245727488
33 2455674532
34 4842782497
35 9554018554
36 18855375593
37 37224944572

List of values

[1, 2, 3, 6, 11, 20, 38, 72, 136, 260, 499, 958, 1847, 3572, 6917, 13422, 26097, 50808, 99049, 193354, 377857, 739148, 1447292, 2836316, 5562774, 10918180, 21444029, 42143986, 82874681, 163060540, 320996342, 632211192, 1245727488, 2455674532, 4842782497, 9554018554, 18855375593, 37224944572]

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

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