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A197405 as a simple table

na(n)
15
271
3358
43305
525621
6199384
71634731
813013551
9103260478
10825286477
116597403489
1252719871616
13421012069157
143360781198751
1526839340562982
16214392512110323
171712358386200271
1813675010695945780
19109210026376844947

[5,71,358,3305,25621,199384,1634731,13013551,
 103260478,825286477,6597403489,52719871616,
 421012069157,3360781198751,26839340562982,
 214392512110323,1712358386200271,
 13675010695945780,109210026376844947]