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A181857 as a simple table

n a(n)
0 0
1 1
2 4
3 18
4 48
5 600
6 720
7 35280
8 40320
9 362880
10 3628800
11 439084800
12 479001600
13 80951270400
14 87178291200
15 1307674368000
16 20922789888000
17 6046686277632000
18 6402373705728000
19 2311256907767808000
20 2432902008176640000
21 51090942171709440000
22 1124000727777607680000

[0,1,4,18,48,600,720,35280,40320,362880,3628800,
 439084800,479001600,80951270400,87178291200,
 1307674368000,20922789888000,6046686277632000,
 6402373705728000,2311256907767808000,
 2432902008176640000,51090942171709440000,
 1124000727777607680000]

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Last modified March 29 15:58 EDT 2020. Contains 333107 sequences. (Running on oeis4.)