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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.

A034742 Dirichlet convolution of Moebius function mu(n) (A008683) with Catalan numbers (A000108).

Table of values

n a(n)
1 1
2 0
3 1
4 4
5 13
6 40
7 131
8 424
9 1428
10 4848
11 16795
12 58740
13 208011
14 742768
15 2674425
16 9694416
17 35357669
18 129643320
19 477638699
20 1767258324
21 6564120287
22 24466250224
23 91482563639
24 343059554440
25 1289904147310
26 4861946193440
27 18367353070722
28 69533550173100
29 263747951750359

List of values

[1, 0, 1, 4, 13, 40, 131, 424, 1428, 4848, 16795, 58740, 208011, 742768, 2674425, 9694416, 35357669, 129643320, 477638699, 1767258324, 6564120287, 24466250224, 91482563639, 343059554440, 1289904147310, 4861946193440, 18367353070722, 69533550173100, 263747951750359]

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

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