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A337899 as a simple table

na(n)
10
21
321
4140
5575
61785
74606
810416
921330
1040425
1171995
12121836
13197561
14308945
15468300
16690880
17995316
181404081
191943985
202646700
213549315
224694921
236133226
247921200
2510123750
2612814425
2716076151
2820001996

[0,1,21,140,575,1785,4606,10416,21330,40425,71995,
 121836,197561,308945,468300,690880,995316,1404081,
 1943985,2646700,3549315,4694921,6133226,7921200,
 10123750,12814425,16076151,20001996]