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A172727 as a simple table

na(n)
10
20
30
40
50
6720
7887226868605
82867622077261705078784
924875052693330062712109843270944
10649308484381906359124692131947427492018400

[0,0,0,0,0,720,887226868605,
 2867622077261705078784,
 24875052693330062712109843270944,
 649308484381906359124692131947427492018400]