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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.

A206820 a(n) is the sum of the squares of the sizes of the conjugacy classes in the symmetric group A_n.

Table of values

n a(n)
1 1
2 1
3 3
4 42
5 914
6 23694
7 1048542
8 45379878
9 3272115926
10 257662344206
11 27726935045366
12 3101635433302996
13 474878584235678020
14 76786899439922296204
15 15844064187141655171020
16 3326909755872288926885670
17 897661138669999282018222470
18 246381314116108359863665821750

List of values

[1, 1, 3, 42, 914, 23694, 1048542, 45379878, 3272115926, 257662344206, 27726935045366, 3101635433302996, 474878584235678020, 76786899439922296204, 15844064187141655171020, 3326909755872288926885670, 897661138669999282018222470, 246381314116108359863665821750]

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

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