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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.

A327025 a(n) = Sum_{k=0..n} k! * Sum_{d|n} phi(d) * A008284(n/d, k).

Table of values

n a(n)
0 1
1 1
2 4
3 11
4 40
5 165
6 930
7 6109
8 47364
9 416259
10 4092332
11 44424105
12 527512456
13 6798907261
14 94504292830
15 1408973416983
16 22426222792568
17 379522092608193
18 6804315178122972
19 128828842646944153
20 2568533750232696472
21 53788282243854348683
22 1180357162840669081094

List of values

[1, 1, 4, 11, 40, 165, 930, 6109, 47364, 416259, 4092332, 44424105, 527512456, 6798907261, 94504292830, 1408973416983, 22426222792568, 379522092608193, 6804315178122972, 128828842646944153, 2568533750232696472, 53788282243854348683, 1180357162840669081094]

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

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