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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.

A338436 a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} 1 / (1 - x^k/k!).

Table of values

n a(n)
0 1
1 1
2 2
3 9
4 28
5 245
6 726
7 11480
8 48560
9 735705
10 4352050
11 98329550
12 483122388
13 15543026746
14 105478954140
15 2717386363515
16 25322712724800
17 896697825211141
18 6457456535543802
19 307183340680888754
20 2920059397230745400
21 107461248960479482740
22 1360407935621917573380

List of values

[1, 1, 2, 9, 28, 245, 726, 11480, 48560, 735705, 4352050, 98329550, 483122388, 15543026746, 105478954140, 2717386363515, 25322712724800, 896697825211141, 6457456535543802, 307183340680888754, 2920059397230745400, 107461248960479482740, 1360407935621917573380]

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

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