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A168488 as a simple table

na(n)
01
11
216
320736
46879707136
51426576071720960000
6383375999244747512217600000000
7247370021455402476126653493805056000000000000

[1,1,16,20736,6879707136,1426576071720960000,
 383375999244747512217600000000,
 247370021455402476126653493805056000000000000]