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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.

A208250 The sum of the largest preimage over all functions f:{1,2,...,n}->{1,2,...,n}.

Table of values

n a(n)
0 0
1 1
2 6
3 51
4 544
5 7145
6 112356
7 2066323
8 43574336
9 1036922769
10 27486891100
11 803137535321
12 25642631336400
13 888148407804853
14 33165208812574216
15 1328185604750416875
16 56783630865774075136
17 2581268127178259819297
18 124322489582200453748268
19 6324172127062894070727625

List of values

[0, 1, 6, 51, 544, 7145, 112356, 2066323, 43574336, 1036922769, 27486891100, 803137535321, 25642631336400, 888148407804853, 33165208812574216, 1328185604750416875, 56783630865774075136, 2581268127178259819297, 124322489582200453748268, 6324172127062894070727625]

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

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