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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.

A290840 a(n) = n! * [x^n] exp(n*x)/(1 + LambertW(-x)).

Table of values

n a(n)
0 1
1 2
2 12
3 117
4 1584
5 27525
6 585108
7 14726411
8 428551616
9 14161828185
10 523952280900
11 21456869976135
12 963553844335536
13 47078974421716757
14 2486272976536821332
15 141118622400977894475
16 8566597074999702384384
17 553816179165426157329201
18 37985975117322654130568964

List of values

[1, 2, 12, 117, 1584, 27525, 585108, 14726411, 428551616, 14161828185, 523952280900, 21456869976135, 963553844335536, 47078974421716757, 2486272976536821332, 141118622400977894475, 8566597074999702384384, 553816179165426157329201, 37985975117322654130568964]

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

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