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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.

A258312 Sum over all Motzkin paths of length n of products over all peaks p of 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 2
3 5
4 14
5 43
6 141
7 490
8 1785
9 6789
10 26809
11 109632
12 462755
13 2012441
14 8997402
15 41297927
16 194306557
17 936082502
18 4612095475
19 23219012907
20 119328025012
21 625545408219
22 3342370197206
23 18190297736313
24 100768960522871
25 567886743369378
26 3253833477309093

List of values

[1, 1, 2, 5, 14, 43, 141, 490, 1785, 6789, 26809, 109632, 462755, 2012441, 8997402, 41297927, 194306557, 936082502, 4612095475, 23219012907, 119328025012, 625545408219, 3342370197206, 18190297736313, 100768960522871, 567886743369378, 3253833477309093]

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

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