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A290961 as a simple table

na(n)
11
21
32
46
524
6840
7720
85040
940320
1059814720
113628800
1283701537920
13479001600
1426980643289600
152642646473026560
161307674368000
1720922789888000
1841837259585747225600
196402373705728000
20598354114828973074790400
2118160977780223038067507200

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