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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.

A154887 Number of ways to partition n into distinct reduced fractions i/j with j <= n.

Table of values

n a(n)
1 1
2 2
3 11
4 71
5 838
6 7915
7 181443
8 3529287
9 130501170
10 4118232210
11 269279551654
12 9556917233108
13 1003141976524301
14 74252913818290142
15 14979717449141067931
16 1451159432555957095630
17 363482056748832080145666
18 28348494499719127795555178
19 10422254792015005991605309232

List of values

[1, 2, 11, 71, 838, 7915, 181443, 3529287, 130501170, 4118232210, 269279551654, 9556917233108, 1003141976524301, 74252913818290142, 14979717449141067931, 1451159432555957095630, 363482056748832080145666, 28348494499719127795555178, 10422254792015005991605309232]

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

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