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A309080 as a simple table

na(n)
12
25
33
420
5570
6341400
7116758458000
813632577445813641200000
9185847167817698504752014113195034069600000000
1034539169785859790805229099212216829464451540660176789302662465332580254227520000000000000

[2,5,3,20,570,341400,116758458000,
 13632577445813641200000,
 185847167817698504752014113195034069600000000,
 34539169785859790805229099212216829464451540660176\
 789302662465332580254227520000000000000]