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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.

A167638 Number of Dyck paths of semilength n, having no ascents and no descents of length 1, and having no peaks at even level.

Table of values

n a(n)
0 1
1 0
2 0
3 1
4 0
5 2
6 1
7 5
8 5
9 15
10 21
11 51
12 85
13 188
14 344
15 730
16 1407
17 2935
18 5831
19 12094
20 24480
21 50754
22 103995
23 216043
24 446447
25 930206
26 1934328
27 4043275
28 8448882
29 17716170
30 37166403
31 78163336
32 164520540
33 346935912
34 732317063
35 1548096255
36 3275859473

List of values

[1, 0, 0, 1, 0, 2, 1, 5, 5, 15, 21, 51, 85, 188, 344, 730, 1407, 2935, 5831, 12094, 24480, 50754, 103995, 216043, 446447, 930206, 1934328, 4043275, 8448882, 17716170, 37166403, 78163336, 164520540, 346935912, 732317063, 1548096255, 3275859473]

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

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