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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.

A343848 a(n) = Sum_{k = 0..n} (n - k)! LaguerreL(n - k, -k).

Table of values

n a(n)
0 1
1 2
2 5
3 17
4 77
5 444
6 3123
7 25933
8 248163
9 2687200
10 32460889
11 432482545
12 6296217017
13 99388128516
14 1690073020687
15 30788225809509
16 597998944638879
17 12332575195452440
18 269072563350272149
19 6190949611140562505
20 149789737789559221397
21 3801359947725801283196

List of values

[1, 2, 5, 17, 77, 444, 3123, 25933, 248163, 2687200, 32460889, 432482545, 6296217017, 99388128516, 1690073020687, 30788225809509, 597998944638879, 12332575195452440, 269072563350272149, 6190949611140562505, 149789737789559221397, 3801359947725801283196]

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

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