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A191555 as a simple table

na(n)
01
12
212
3720
43628800
5144850083840000
6272760108249915378892800000000
71264767303092594444142256488682840323816161280000000000000000

[1,2,12,720,3628800,144850083840000,
 272760108249915378892800000000,
 12647673030925944441422564886828403238161612800000\
 00000000000]