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A215229 as a simple table

na(n)
10
218
3408
42940
512600
640110
7105168
8240408
9496080
10945450
111690920
122870868
134667208
147313670
1511104800
1616405680
1723662368
1833413058
1946299960
2063081900
2184647640
22112029918
23146420208
24189184200
25241878000
26306265050
27384333768

[0,18,408,2940,12600,40110,105168,240408,496080,
 945450,1690920,2870868,4667208,7313670,11104800,
 16405680,23662368,33413058,46299960,63081900,
 84647640,112029918,146420208,189184200,241878000,
 306265050,384333768]