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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.

A320430 Number of set partitions of [n] where the elements of each non-singleton block are pairwise coprime.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 10
5 37
6 60
7 295
8 658
9 2621
10 5368
11 38535
12 66506
13 551529
14 1234264
15 5004697
16 13721836
17 143935131
18 256835337
19 2971237021
20 6485081140
21 35162930303
22 95872321543
23 1315397878401
24 2399236456202
25 25866803180347
26 72374386475590
27 563368417647305
28 1479943119911866

List of values

[1, 1, 2, 5, 10, 37, 60, 295, 658, 2621, 5368, 38535, 66506, 551529, 1234264, 5004697, 13721836, 143935131, 256835337, 2971237021, 6485081140, 35162930303, 95872321543, 1315397878401, 2399236456202, 25866803180347, 72374386475590, 563368417647305, 1479943119911866]

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

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