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A191461 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 18
5 24
6 480
7 720
8 23520
9 100800
10 1874880
11 3628800
12 341953920
13 479001600
14 36739422720
15 468583315200
16 8960682931200
17 20922789888000
18 4289844445286400
19 6402373705728000
20 1012647189038284800
21 18895538930171904000
22 350378437544239104000

[1,1,1,2,18,24,480,720,23520,100800,1874880,
 3628800,341953920,479001600,36739422720,
 468583315200,8960682931200,20922789888000,
 4289844445286400,6402373705728000,
 1012647189038284800,18895538930171904000,
 350378437544239104000]

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)