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A251266 as a simple table

na(n)
1502
23894
331936
4279718
52510004
622806904
7208452452
81910905110
917543333688
10161181383956
111481444894708
1213618944927408
13125212172603876
141151259684237236
1510585524477077008
1697332520279830066
17894966894170134936

[502,3894,31936,279718,2510004,22806904,208452452,
 1910905110,17543333688,161181383956,1481444894708,
 13618944927408,125212172603876,1151259684237236,
 10585524477077008,97332520279830066,
 894966894170134936]