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A052579 as a simple table

na(n)
02
11
22
312
424
5120
61440
75040
840320
9725760
103628800
1139916800
12958003200
136227020800
1487178291200
152615348736000
1620922789888000
17355687428096000
1812804747411456000
19121645100408832000
202432902008176640000

[2,1,2,12,24,120,1440,5040,40320,725760,3628800,
 39916800,958003200,6227020800,87178291200,
 2615348736000,20922789888000,355687428096000,
 12804747411456000,121645100408832000,
 2432902008176640000]