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A027024 as a simple table

na(n)
21
35
413
527
653
7101
8189
9351
10649
111197
122205
134059
147469
1513741
1625277
1746495
1885521
19157301
20289325
21532155
22978789
231800277
243311229
256090303
2611201817
2720603357
2837895485
2969700667
30128199517
31235795677
32433695869

[1,5,13,27,53,101,189,351,649,1197,2205,4059,7469,
 13741,25277,46495,85521,157301,289325,532155,
 978789,1800277,3311229,6090303,11201817,20603357,
 37895485,69700667,128199517,235795677,433695869]