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A157573 as a simple table

na(n)
21
33
4246
517230
61034445
759305701
83243926588
9185256960120
1010229264210745
11504340200498475
1222766981281651398
13968060807776968126
1439440547846380819957
151553885734839506217555
1659443252831855326838200

[1,3,246,17230,1034445,59305701,3243926588,
 185256960120,10229264210745,504340200498475,
 22766981281651398,968060807776968126,
 39440547846380819957,1553885734839506217555,
 59443252831855326838200]