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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.

A258172 Sum over all Dyck paths of semilength n of products over all peaks p of x_p, where x_p is the x-coordinate of peak p.

Table of values

n a(n)
0 1
1 1
2 5
3 40
4 434
5 5901
6 95997
7 1812525
8 38875265
9 932135347
10 24678938063
11 714385754446
12 22428656766320
13 758632387171075
14 27489135956517315
15 1061913384743418360
16 43550536908458238570
17 1889211624465639489675
18 86406059558668152123975
19 4154647501527354507485040

List of values

[1, 1, 5, 40, 434, 5901, 95997, 1812525, 38875265, 932135347, 24678938063, 714385754446, 22428656766320, 758632387171075, 27489135956517315, 1061913384743418360, 43550536908458238570, 1889211624465639489675, 86406059558668152123975, 4154647501527354507485040]

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

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