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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.

A290158 a(n) = n! * [x^n] exp(-n*x)/(1 + LambertW(-x)).

Table of values

n a(n)
0 1
1 0
2 4
3 -9
4 208
5 -1525
6 33516
7 -463099
8 11293248
9 -231839577
10 6517863100
11 -175791146311
12 5723314711632
13 -189288946716181
14 7083626583237036
15 -275649085963046475
16 11724766124450058496
17 -522717581675749841713
18 24981438186138642481404

List of values

[1, 0, 4, -9, 208, -1525, 33516, -463099, 11293248, -231839577, 6517863100, -175791146311, 5723314711632, -189288946716181, 7083626583237036, -275649085963046475, 11724766124450058496, -522717581675749841713, 24981438186138642481404]

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

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