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A219506 as a simple table

na(n)
03
15
251
353
4140451
5140453
62770663499604051
72770663499604053
821269209556953516583554114034636483645584976451
921269209556953516583554114034636483645584976453

[3,5,51,53,140451,140453,2770663499604051,
 2770663499604053,
 21269209556953516583554114034636483645584976451,
 21269209556953516583554114034636483645584976453]