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A186473 as a simple table

na(n)
1256
2362
34686
416762
5107353
6305089
71849873
85977657
934498177
10116855689
11634602529
122242113937
1311691520969
1442863613697
15216155958361
16816595120705
174006518195025
1815513728255737
1974427875789953
20294085455103369

[256,362,4686,16762,107353,305089,1849873,5977657,
 34498177,116855689,634602529,2242113937,
 11691520969,42863613697,216155958361,816595120705,
 4006518195025,15513728255737,74427875789953,
 294085455103369]