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.

A191309 Number of peaks at height >= 2 in all dispersed Dyck paths of length n (i.e., Motzkin paths of length n with no (1,0) steps at positive heights).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 1
5 2
6 8
7 16
8 47
9 94
10 244
11 488
12 1186
13 2372
14 5536
15 11072
16 25147
17 50294
18 112028
19 224056
20 491870
21 983740
22 2135440
23 4270880
24 9188406
25 18376812
26 39249768
27 78499536
28 166656772
29 333313544
30 704069248
31 1408138496
32 2961699667
33 5923399334
34 12412521388
35 24825042776

List of values

[0, 0, 0, 0, 1, 2, 8, 16, 47, 94, 244, 488, 1186, 2372, 5536, 11072, 25147, 50294, 112028, 224056, 491870, 983740, 2135440, 4270880, 9188406, 18376812, 39249768, 78499536, 166656772, 333313544, 704069248, 1408138496, 2961699667, 5923399334, 12412521388, 24825042776]

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

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