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.

A002996 a(n) = Sum_{k|n} mu(k)*Catalan(n/k) (mu = Moebius function A008683).

Table of values

n a(n)
1 1
2 1
3 4
4 12
5 41
6 126
7 428
8 1416
9 4857
10 16753
11 58785
12 207868
13 742899
14 2674010
15 9694799
16 35356240
17 129644789
18 477633711
19 1767263189
20 6564103612
21 24466266587
22 91482504853
23 343059613649
24 1289903937896
25 4861946401410
26 18367352329251
27 69533550911142
28 263747949075908
29 1002242216651367

List of values

[1, 1, 4, 12, 41, 126, 428, 1416, 4857, 16753, 58785, 207868, 742899, 2674010, 9694799, 35356240, 129644789, 477633711, 1767263189, 6564103612, 24466266587, 91482504853, 343059613649, 1289903937896, 4861946401410, 18367352329251, 69533550911142, 263747949075908, 1002242216651367]

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

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