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A244015 as a simple table

na(n)
01
12
220
31960
418819920
51735166549767840
614749861913749949808286047759680
71065814268211609269094400465471990022332221793124358274759711360

[1,2,20,1960,18819920,1735166549767840,
 14749861913749949808286047759680,
 10658142682116092690944004654719900223322217931243\
 58274759711360]