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A193831 as a simple table

na(n)
13
27
315
4101
5297
61255
74565
821637
944583
1063261
11329931
121121505
132679689
144697205
156185689
1623338469
1749995925
18431149389
193913864295
2013610949895
2180630964769
22362326859895
23749474411781
242168627105469
253646072432125
2610085065885767
2727152408925615

[3,7,15,101,297,1255,4565,21637,44583,63261,
 329931,1121505,2679689,4697205,6185689,23338469,
 49995925,431149389,3913864295,13610949895,
 80630964769,362326859895,749474411781,
 2168627105469,3646072432125,10085065885767,
 27152408925615]