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A056038 as a simple table

na(n)
01
11
21
31
42
52
66
76
824
924
10720
11720
12720
13720
145040
155040
1640320
1740320
18362880
19362880
203628800
213628800
2239916800
2339916800
24479001600
25479001600
266227020800
276227020800
281307674368000
291307674368000
301307674368000
311307674368000
3220922789888000

[1,1,1,1,2,2,6,6,24,24,720,720,720,720,5040,5040,
 40320,40320,362880,362880,3628800,3628800,
 39916800,39916800,479001600,479001600,6227020800,
 6227020800,1307674368000,1307674368000,
 1307674368000,1307674368000,20922789888000]