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A047974 as a simple table

na(n)
01
11
23
37
425
581
6331
71303
85937
926785
10133651
11669351
123609673
1319674097
14113525595
15664400311
164070168161
1725330978113
18163716695587
191075631907655
207296866339961
2150322142646161
22356790528924523
232570964805355607
2418983329135883665
25142389639792952801
261091556096587136051

[1,1,3,7,25,81,331,1303,5937,26785,133651,669351,
 3609673,19674097,113525595,664400311,4070168161,
 25330978113,163716695587,1075631907655,
 7296866339961,50322142646161,356790528924523,
 2570964805355607,18983329135883665,
 142389639792952801,1091556096587136051]