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A257420 as a simple table

na(n)
12616
27652
330309
4119393
5403951
61293242
74098078
812497488
937528750
10111339861
11326552920
12949466125
132746182574
147900552664
1522633690594
1664617935573
17183950154022
18522353720305
191480269737481
204187439072469

[2616,7652,30309,119393,403951,1293242,4098078,
 12497488,37528750,111339861,326552920,949466125,
 2746182574,7900552664,22633690594,64617935573,
 183950154022,522353720305,1480269737481,
 4187439072469]