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A279309 as a simple table

na(n)
01
12
224
3720
440320
53628800
6479001600
787178291200
820922789888000
96402373705728000
102432902008176640000
111124000727777607680000
12620448401733239439360000
1336662860102418694144000000
14304888344611713860501504000000
1513960676832220582033489920000000

[1,2,24,720,40320,3628800,479001600,87178291200,
 20922789888000,6402373705728000,
 2432902008176640000,1124000727777607680000,
 620448401733239439360000,
 36662860102418694144000000,
 304888344611713860501504000000,
 13960676832220582033489920000000]