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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.

A258180 Sum over all Dyck paths of semilength n of products over all peaks p of C(x_p,y_p), where x_p and y_p are the coordinates of peak p.

Table of values

n a(n)
0 1
1 1
2 4
3 33
4 517
5 15326
6 852912
7 91023697
8 19716262702
9 8794395041567
10 8016790849841585
11 15556074485786226848
12 64891787190080888991273
13 561815453349204340865790817
14 10402242033224422585780623039909
15 423787530114579490372987256671625678

List of values

[1, 1, 4, 33, 517, 15326, 852912, 91023697, 19716262702, 8794395041567, 8016790849841585, 15556074485786226848, 64891787190080888991273, 561815453349204340865790817, 10402242033224422585780623039909, 423787530114579490372987256671625678]

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

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