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A046167 as a simple table

na(n)
10
20
30
40
50
61
7420
8100814
918151560
102723868147
11359750257020
1243199991728608
134817721638970240
14506352103838393813
1550691406225311551700
164872449650707855334482
17452435489306282260691640

[0,0,0,0,0,1,420,100814,18151560,2723868147,
 359750257020,43199991728608,4817721638970240,
 506352103838393813,50691406225311551700,
 4872449650707855334482,452435489306282260691640]