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A157583 as a simple table

na(n)
21
33
4306
519110
61405335
7127596189
810056226796
9714714066732
1047739604854315
112926869332706055
12164336205885920178
138620987583406297606
14434508999474316043459
1521294115220098361584440
161014206441760046027667880

[1,3,306,19110,1405335,127596189,10056226796,
 714714066732,47739604854315,2926869332706055,
 164336205885920178,8620987583406297606,
 434508999474316043459,21294115220098361584440,
 1014206441760046027667880]