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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.

A309910 a(n) = Sum_{k=1..n} (-1)^(n-k) * Stirling1(n,k) * floor(n/k).

Table of values

n a(n)
1 1
2 3
3 10
4 53
5 266
6 2093
7 14512
8 134705
9 1317724
10 14339429
11 156052942
12 2243410945
13 28893239818
14 421448538895
15 6810085942104
16 117497037128065
17 1980909279322608
18 38790292385240321
19 730946685781179418
20 15916872348230275385
21 346942995035062132634
22 7767365425379382284307

List of values

[1, 3, 10, 53, 266, 2093, 14512, 134705, 1317724, 14339429, 156052942, 2243410945, 28893239818, 421448538895, 6810085942104, 117497037128065, 1980909279322608, 38790292385240321, 730946685781179418, 15916872348230275385, 346942995035062132634, 7767365425379382284307]

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

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