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A035521 as a simple table

na(n)
10
20
30
40
51
645
71470
843890
91291815
1038710035
111199167200
1238692476900
131304976397725
1446070080281225
151702810398539250
1665862570279255750
172663551451057371875
18112503209942059311375
194957166849516125744500

[0,0,0,0,1,45,1470,43890,1291815,38710035,
 1199167200,38692476900,1304976397725,
 46070080281225,1702810398539250,65862570279255750,
 2663551451057371875,112503209942059311375,
 4957166849516125744500]