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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.

A350268 a(n) = Sum_{k=0..n} (n - k)! * (n - 1)^k. Row sums of A350269.

Table of values

n a(n)
0 1
1 1
2 4
3 22
4 168
5 1720
6 22670
7 368784
8 7134148
9 159416704
10 4027395330
11 113235212800
12 3501763366904
13 118024658758656
14 4303855119215782
15 168777440194263040
16 7081468496171815500
17 316501174908316647424
18 15010862087643791689322
19 752916261526858377363456

List of values

[1, 1, 4, 22, 168, 1720, 22670, 368784, 7134148, 159416704, 4027395330, 113235212800, 3501763366904, 118024658758656, 4303855119215782, 168777440194263040, 7081468496171815500, 316501174908316647424, 15010862087643791689322, 752916261526858377363456]

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

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