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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.

A341589 a(n) = Sum_{k=n..2*n} |Stirling1(2*n, k) * Stirling1(k, n)|.

Table of values

n a(n)
0 1
1 2
2 40
3 1485
4 81088
5 5856900
6 526685269
7 56704848200
8 7112345477952
9 1018548226480356
10 163987811350464660
11 29321558852248050388
12 5764958268855541178967
13 1236150756215397667568170
14 287086392921014590422630300
15 71789589754855255636302048525
16 19231403740347427723119910379040

List of values

[1, 2, 40, 1485, 81088, 5856900, 526685269, 56704848200, 7112345477952, 1018548226480356, 163987811350464660, 29321558852248050388, 5764958268855541178967, 1236150756215397667568170, 287086392921014590422630300, 71789589754855255636302048525, 19231403740347427723119910379040]

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

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