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.

A286225 Number of compositions (ordered partitions) of n into parts with an even number of distinct prime divisors.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 2
7 3
8 4
9 5
10 7
11 9
12 13
13 18
14 25
15 34
16 46
17 61
18 83
19 112
20 153
21 209
22 286
23 387
24 526
25 713
26 969
27 1317
28 1794
29 2437
30 3312
31 4497
32 6110
33 8302
34 11290
35 15347
36 20865
37 28354
38 38533
39 52361
40 71167
41 96721
42 131464
43 178672
44 242834
45 330020
46 448532
47 609590
48 828511
49 1126037
50 1530418
51 2079977
52 2826896
53 3841998

List of values

[1, 1, 1, 1, 1, 1, 2, 3, 4, 5, 7, 9, 13, 18, 25, 34, 46, 61, 83, 112, 153, 209, 286, 387, 526, 713, 969, 1317, 1794, 2437, 3312, 4497, 6110, 8302, 11290, 15347, 20865, 28354, 38533, 52361, 71167, 96721, 131464, 178672, 242834, 330020, 448532, 609590, 828511, 1126037, 1530418, 2079977, 2826896, 3841998]

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

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