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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.

A375540 a(n) = 2^n * n! * [x^n] (1/2 - exp(-x))^n.

Table of values

n a(n)
0 1
1 2
2 12
3 126
4 1880
5 36250
6 856212
7 23928758
8 772172592
9 28253043378
10 1155731972780
11 52265163565582
12 2589097062756360
13 139428505876012106
14 8110011431007355716
15 506710228437429986790
16 33844577422630735656032
17 2406541293179536265812834
18 181497377154154817667851100

List of values

[1, 2, 12, 126, 1880, 36250, 856212, 23928758, 772172592, 28253043378, 1155731972780, 52265163565582, 2589097062756360, 139428505876012106, 8110011431007355716, 506710228437429986790, 33844577422630735656032, 2406541293179536265812834, 181497377154154817667851100]

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

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