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.

A191792 Number of length n left factors of Dyck paths having no UDUD's; here U=(1,1) and D=(1,-1).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 5
5 8
6 15
7 25
8 46
9 79
10 147
11 256
12 477
13 841
14 1570
15 2791
16 5217
17 9336
18 17467
19 31421
20 58830
21 106279
22 199103
23 360960
24 676545
25 1230185
26 2306642
27 4204931
28 7887045
29 14409480
30 27035135
31 49487641
32 92872062
33 170289575
34 319647235
35 586983680
36 1102027213
37 2026422689
38 3805138290

List of values

[1, 1, 2, 3, 5, 8, 15, 25, 46, 79, 147, 256, 477, 841, 1570, 2791, 5217, 9336, 17467, 31421, 58830, 106279, 199103, 360960, 676545, 1230185, 2306642, 4204931, 7887045, 14409480, 27035135, 49487641, 92872062, 170289575, 319647235, 586983680, 1102027213, 2026422689, 3805138290]

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

Content is available under The OEIS End-User License Agreement.