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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.

A180589 a(n) = floor(n!*h(n)/n), where h(n) = Sum_{k=1..n} 1/k.

Table of values

n a(n)
1 1
2 1
3 3
4 12
5 54
6 294
7 1866
8 13698
9 114064
10 1062864
11 10958530
12 123870240
13 1523289156
14 20247546240
15 289277533440
16 4420892649600
17 71965034739952
18 1243166003251200
19 22713955095665178
20 437647401838080000
21 8868800513341440000
22 188567126333429760000
23 4197346376195350706086

List of values

[1, 1, 3, 12, 54, 294, 1866, 13698, 114064, 1062864, 10958530, 123870240, 1523289156, 20247546240, 289277533440, 4420892649600, 71965034739952, 1243166003251200, 22713955095665178, 437647401838080000, 8868800513341440000, 188567126333429760000, 4197346376195350706086]

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

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