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A279311 as a simple table

na(n)
01
11
22
32
424
524
6720
7720
84480
940320
103628800
113628800
12479001600
1395800320
142641766400
1587178291200
161902071808000
1720922789888000
186402373705728000
196402373705728000
20810967336058880000
21143111882833920000
2266117689869271040000
2313223537973854208000

[1,1,2,2,24,24,720,720,4480,40320,3628800,3628800,
 479001600,95800320,2641766400,87178291200,
 1902071808000,20922789888000,6402373705728000,
 6402373705728000,810967336058880000,
 143111882833920000,66117689869271040000,
 13223537973854208000]