cp's OEIS Frontend

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.

A258222 A(n,k) is the sum over all Dyck paths of semilength n of products over all peaks p of (k*x_p+y_p)/y_p, where x_p and y_p are the coordinates of peak p; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 1
7 3
8 10
9 5
10 1
11 4
12 24
13 74
14 14
15 1
16 5
17 44
18 297
19 706
20 42
21 1
22 6
23 70
24 764
25 4896
26 8162
27 132
28 1
29 7
30 102
31 1565
32 17924
33 100278
34 110410
35 429
36 1
37 8
38 140
39 2790
40 47650
41 527844
42 2450304
43 1708394
44 1430
45 1
46 9
47 184
48 4529
49 104454
50 1831250
51 18685164
52 69533397
53 29752066
54 4862

List of values

[1, 1, 1, 1, 2, 2, 1, 3, 10, 5, 1, 4, 24, 74, 14, 1, 5, 44, 297, 706, 42, 1, 6, 70, 764, 4896, 8162, 132, 1, 7, 102, 1565, 17924, 100278, 110410, 429, 1, 8, 140, 2790, 47650, 527844, 2450304, 1708394, 1430, 1, 9, 184, 4529, 104454, 1831250, 18685164, 69533397, 29752066, 4862]