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.

A109195 Triangle read by rows: T(n,k) is number of Grand Motzkin paths of length n having k returns to the x-axis from above (i.e., d steps hitting the x-axis).

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 4
5 3
6 9
7 9
8 1
9 21
10 25
11 5
12 51
13 69
14 20
15 1
16 127
17 189
18 70
19 7
20 323
21 518
22 230
23 35
24 1
25 835
26 1422
27 726
28 147
29 9
30 2188
31 3915
32 2235
33 560
34 54
35 1
36 5798
37 10813
38 6765
39 2002
40 264
41 11
42 15511
43 29964
44 20240
45 6853
46 1143
47 77
48 1
49 41835
50 83304
51 60060
52 22737
53 4563
54 429
55 13

List of values

[1, 1, 2, 1, 4, 3, 9, 9, 1, 21, 25, 5, 51, 69, 20, 1, 127, 189, 70, 7, 323, 518, 230, 35, 1, 835, 1422, 726, 147, 9, 2188, 3915, 2235, 560, 54, 1, 5798, 10813, 6765, 2002, 264, 11, 15511, 29964, 20240, 6853, 1143, 77, 1, 41835, 83304, 60060, 22737, 4563, 429, 13]