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A215712 as a simple table

na(n)
13
29
381
421
51359
62727
721837
821843
9349515
10699045
115592393
122796201
1389478471
14178956963
151431655749
161431655761
1722906492227
1845812984481
19366503875905
2022906492245
215864062014783
2211728124029599
2393824992236861
2493824992236879
251501199875790139

[3,9,81,21,1359,2727,21837,21843,349515,699045,
 5592393,2796201,89478471,178956963,1431655749,
 1431655761,22906492227,45812984481,366503875905,
 22906492245,5864062014783,11728124029599,
 93824992236861,93824992236879,1501199875790139]