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.

A274112 Number of equivalence classes of ballot paths of length n for the string ddu.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 3
6 4
7 5
8 8
9 12
10 17
11 23
12 35
13 52
14 75
15 105
16 157
17 232
18 337
19 480
20 712
21 1049
22 1529
23 2199
24 3248
25 4777
26 6976
27 10092
28 14869
29 21845
30 31937
31 46377
32 68222
33 100159
34 146536
35 213328
36 313487
37 460023
38 673351
39 981976
40 1441999
41 2115350
42 3097326
43 4522529
44 6637879
45 9735205
46 14257734
47 20836827
48 30572032
49 44829766
50 65666593

List of values

[1, 1, 1, 1, 2, 3, 4, 5, 8, 12, 17, 23, 35, 52, 75, 105, 157, 232, 337, 480, 712, 1049, 1529, 2199, 3248, 4777, 6976, 10092, 14869, 21845, 31937, 46377, 68222, 100159, 146536, 213328, 313487, 460023, 673351, 981976, 1441999, 2115350, 3097326, 4522529, 6637879, 9735205, 14257734, 20836827, 30572032, 44829766, 65666593]