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A290961 as a simple table

n a(n)
1 1
2 1
3 2
4 6
5 24
6 840
7 720
8 5040
9 40320
10 59814720
11 3628800
12 83701537920
13 479001600
14 26980643289600
15 2642646473026560
16 1307674368000
17 20922789888000
18 41837259585747225600
19 6402373705728000
20 598354114828973074790400
21 18160977780223038067507200

[1,1,2,6,24,840,720,5040,40320,59814720,3628800,
 83701537920,479001600,26980643289600,
 2642646473026560,1307674368000,20922789888000,
 41837259585747225600,6402373705728000,
 598354114828973074790400,
 18160977780223038067507200]

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Last modified October 20 15:29 EDT 2019. Contains 328267 sequences. (Running on oeis4.)