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A058816 as a simple table

n a(n)
0 2
1 4
2 8
3 48
4 96
5 960
6 5760
7 80640
8 161280
9 193536
10 1161216
11 18247680
12 3832012800
13 603832320
14 1394852659200
15 8369115955200
16 2536095744000
17 948499808256000
18 51218989645824000
19 1946321606541312000
20 19463216065413120000
21 90828341638594560000

[2,4,8,48,96,960,5760,80640,161280,193536,1161216,
 18247680,3832012800,603832320,1394852659200,
 8369115955200,2536095744000,948499808256000,
 51218989645824000,1946321606541312000,
 19463216065413120000,90828341638594560000]

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)