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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.

A058806 a(n) = n! * H_n(n) where H_0(n) = 1/n, H_m(n) = Sum_{k=1..n} H_{m-1}(k).

Table of values

n a(n)
1 1
2 5
3 47
4 638
5 11274
6 245004
7 6314664
8 188204400
9 6366517200
10 240947474400
11 10086271796160
12 462688566802560
13 23080457713017600
14 1243853764482470400
15 72018614888670643200
16 4458392682933188966400
17 293860908364035250022400
18 20545850809171272549888000
19 1518779004111434057997312000

List of values

[1, 5, 47, 638, 11274, 245004, 6314664, 188204400, 6366517200, 240947474400, 10086271796160, 462688566802560, 23080457713017600, 1243853764482470400, 72018614888670643200, 4458392682933188966400, 293860908364035250022400, 20545850809171272549888000, 1518779004111434057997312000]

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

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