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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.

A258173 Sum over all Dyck paths of semilength n of products over all peaks p of y_p, where y_p is the y-coordinate of peak p.

Table of values

n a(n)
0 1
1 1
2 3
3 12
4 58
5 321
6 1975
7 13265
8 96073
9 743753
10 6113769
11 53086314
12 484861924
13 4641853003
14 46441475253
15 484327870652
16 5252981412262
17 59132909030463
18 689642443691329
19 8319172260103292
20 103645882500123026
21 1331832693574410475
22 17629142345935969713

List of values

[1, 1, 3, 12, 58, 321, 1975, 13265, 96073, 743753, 6113769, 53086314, 484861924, 4641853003, 46441475253, 484327870652, 5252981412262, 59132909030463, 689642443691329, 8319172260103292, 103645882500123026, 1331832693574410475, 17629142345935969713]

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

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