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A172576 as a simple table

na(n)
10
20
30
40
51
63246670537110000
7352231966693098849132080247442500
8203269774721184658406475682049947158681837795504000
9746770363520310669802381642326970209622854085785862010798716821780000

[0,0,0,0,1,3246670537110000,
 352231966693098849132080247442500,
 20326977472118465840647568204994715868183779550400\
 0,
 74677036352031066980238164232697020962285408578586\
 2010798716821780000]