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A081138 as a simple table

na(n)
00
10
21
324
4384
55120
661440
7688128
87340032
975497472
10754974720
117381975040
1270866960384
13670014898176
146253472382976
1557724360458240
16527765581332480
174785074604081152
1843065671436730368
19385057768140177408

[0,0,1,24,384,5120,61440,688128,7340032,75497472,
 754974720,7381975040,70866960384,670014898176,
 6253472382976,57724360458240,527765581332480,
 4785074604081152,43065671436730368,
 385057768140177408]