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A219710 as a simple table

na(n)
120
2125
31751
423506
5245205
62326019
721036433
8180509639
91458287494
1011082376729
1179456239834
12539674743558
133488011587815
1421545098178172
15127698505774282
16728875173290252
174019100286657877
1821469186347860585

[20,125,1751,23506,245205,2326019,21036433,
 180509639,1458287494,11082376729,79456239834,
 539674743558,3488011587815,21545098178172,
 127698505774282,728875173290252,4019100286657877,
 21469186347860585]