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A319949 as a simple table

n a(n)
1 1
2 2
3 8
4 40
5 240
6 1920
7 17280
8 172800
9 2073600
10 26956800
11 377395200
12 6038323200
13 102651494400
14 1847726899200
15 36954537984000
16 776045297664000
17 17072996548608000
18 409751917166592000
19 10243797929164800000
20 266338746158284800000

[1,2,8,40,240,1920,17280,172800,2073600,26956800,
 377395200,6038323200,102651494400,1847726899200,
 36954537984000,776045297664000,17072996548608000,
 409751917166592000,10243797929164800000,
 266338746158284800000]

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)