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A038058 as a simple table

na(n)
01
12
24
324
4256
54000
682944
72151296
867108864
92448880128
10102400000000
114829076871168
12253613523861504
1314681377947951104
14928873060356849664
1563772920000000000000
164722366482869645213696
17375183514207494575620096

[1,2,4,24,256,4000,82944,2151296,67108864,
 2448880128,102400000000,4829076871168,
 253613523861504,14681377947951104,
 928873060356849664,63772920000000000000,
 4722366482869645213696,375183514207494575620096]