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A166828 as a simple table

na(n)
10
20
330
4728
55364
624402
784285
8242793
9614140
101407960
112987500
125953706
1311263472
1420392138
1535552387
1659984019
1798331688
18157130592
19245423322

[0,0,30,728,5364,24402,84285,242793,614140,
 1407960,2987500,5953706,11263472,20392138,
 35552387,59984019,98331688,157130592,245423322]