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.

A000666 Number of symmetric relations on n nodes.

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 90
5 544
6 5096
7 79264
8 2208612
9 113743760
10 10926227136
11 1956363435360
12 652335084592096
13 405402273420996800
14 470568642161119963904
15 1023063423471189431054720
16 4178849203082023236058229792
17 32168008290073542372004082199424

List of values

[1, 2, 6, 20, 90, 544, 5096, 79264, 2208612, 113743760, 10926227136, 1956363435360, 652335084592096, 405402273420996800, 470568642161119963904, 1023063423471189431054720, 4178849203082023236058229792, 32168008290073542372004082199424]

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

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