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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.

A354341 a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} 1/(d * ((k/d)!)^d) )/(n-k)!.

Table of values

n a(n)
1 1
2 4
3 12
4 38
5 130
6 557
7 2877
8 18314
9 136458
10 1180457
11 11389081
12 122833207
13 1446973931
14 18594740348
15 257507754524
16 3835059283282
17 60937544854850
18 1030871972064485
19 18469079943443229
20 349656695460113159
21 6969526853682012755
22 145958486484692023936

List of values

[1, 4, 12, 38, 130, 557, 2877, 18314, 136458, 1180457, 11389081, 122833207, 1446973931, 18594740348, 257507754524, 3835059283282, 60937544854850, 1030871972064485, 18469079943443229, 349656695460113159, 6969526853682012755, 145958486484692023936]

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

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