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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.

A191394 Number of base pyramids in all dispersed Dyck paths of length n (i.e., in all Motzkin paths of length n with no (1,0)-steps at positive heights).

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 6
5 12
6 28
7 56
8 121
9 242
10 507
11 1014
12 2093
13 4186
14 8569
15 17138
16 34902
17 69804
18 141664
19 283328
20 573574
21 1147148
22 2318010
23 4636020
24 9354540
25 18709080
26 37708672
27 75417344
28 151868100
29 303736200
30 611180252
31 1222360504
32 2458123705
33 4916247410
34 9881255187

List of values

[0, 0, 1, 2, 6, 12, 28, 56, 121, 242, 507, 1014, 2093, 4186, 8569, 17138, 34902, 69804, 141664, 283328, 573574, 1147148, 2318010, 4636020, 9354540, 18709080, 37708672, 75417344, 151868100, 303736200, 611180252, 1222360504, 2458123705, 4916247410, 9881255187]

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

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