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A157581 as a simple table

na(n)
21
315
4390
521010
61806015
7123582921
87932838172
9541388995092
1035637846633315
112098170095389555
12113237331813959034
135754386605886291022
14280189305372079613419
1513193562175797681608910
16603200922513642478421880

[1,15,390,21010,1806015,123582921,7932838172,
 541388995092,35637846633315,2098170095389555,
 113237331813959034,5754386605886291022,
 280189305372079613419,13193562175797681608910,
 603200922513642478421880]