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A026069 as a simple table

na(n)
31
45
513
640
7116
8342
91002
102941
118629
1225333
1374405
14218659
15642955
161891683
175568867
1816403283
1948342867
20142548639
21420546039
221241293314
233665526270
2410829045472
2532005684340
2694632148659
27279909001851
28828235716571
292451561077995

[1,5,13,40,116,342,1002,2941,8629,25333,74405,
 218659,642955,1891683,5568867,16403283,48342867,
 142548639,420546039,1241293314,3665526270,
 10829045472,32005684340,94632148659,279909001851,
 828235716571,2451561077995]