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A166840 as a simple table

na(n)
10
20
330
4728
55364
624401
784279
8242772
9614084
101407834
112987248
125953244
1311262680
1420390851
1535550385
1659981016
1798327320
18157124404
19245414754

[0,0,30,728,5364,24401,84279,242772,614084,
 1407834,2987248,5953244,11262680,20390851,
 35550385,59981016,98327320,157124404,245414754]