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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.

A129838 Number of up/down (or down/up) compositions of n into distinct parts.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 3
6 5
7 6
8 8
9 11
10 18
11 21
12 30
13 38
14 52
15 78
16 97
17 128
18 170
19 222
20 285
21 421
22 510
23 683
24 872
25 1148
26 1440
27 1893
28 2576
29 3209
30 4151
31 5313
32 6784
33 8615
34 10969
35 13755
36 18573
37 22713
38 29173
39 36536
40 46705
41 57899
42 73696
43 91076
44 114777
45 148531
46 182813
47 228938
48 287042

List of values

[1, 1, 1, 2, 2, 3, 5, 6, 8, 11, 18, 21, 30, 38, 52, 78, 97, 128, 170, 222, 285, 421, 510, 683, 872, 1148, 1440, 1893, 2576, 3209, 4151, 5313, 6784, 8615, 10969, 13755, 18573, 22713, 29173, 36536, 46705, 57899, 73696, 91076, 114777, 148531, 182813, 228938, 287042]

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

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