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A074541 as a simple table

na(n)
03
115
289
3567
43713
524615
6164369
71103607
87444673
950431815
10342942449
112340125847
1216018073633
13109949712615
14756587253329
155217746527287
1636054040542593
17249557173563015
181729973554841009
1912008254925907927

[3,15,89,567,3713,24615,164369,1103607,7444673,
 50431815,342942449,2340125847,16018073633,
 109949712615,756587253329,5217746527287,
 36054040542593,249557173563015,1729973554841009,
 12008254925907927]