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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.

A159324 n! times the average number of comparisons required by an insertion sort of n (distinct) elements.

Table of values

n a(n)
0 0
1 0
2 2
3 16
4 118
5 926
6 7956
7 75132
8 777456
9 8771184
10 107307360
11 1416252960
12 20068629120
13 304002322560
14 4903642679040
15 83928856838400
16 1519397749094400
17 29010025797580800
18 582647327132774400
19 12280347845905305600
20 271030782903552000000
21 6251213902855219200000

List of values

[0, 0, 2, 16, 118, 926, 7956, 75132, 777456, 8771184, 107307360, 1416252960, 20068629120, 304002322560, 4903642679040, 83928856838400, 1519397749094400, 29010025797580800, 582647327132774400, 12280347845905305600, 271030782903552000000, 6251213902855219200000]

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

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