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A042921 as a simple table

na(n)
01
12
2125
3252
415749
531750
61984249
74000248
8249999625
9503999498
1031497968501
1163499936500
123968494031501
138000487999502
14499998750000625
151007997988000752
1662995874006047249
17126999746000095250
187936980126011952749
1916000959998024000748

[1,2,125,252,15749,31750,1984249,4000248,
 249999625,503999498,31497968501,63499936500,
 3968494031501,8000487999502,499998750000625,
 1007997988000752,62995874006047249,
 126999746000095250,7936980126011952749,
 16000959998024000748]