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A253846 as a simple table

na(n)
1263476
2265117
3201331
4204420
5209862
6295098
7427510
8627452
9963880
101514191
112521112
124297857
137398589
1412871519
1522452335
1638934291
1766781746
18113008987
19188383014
20309220327
21499665691
22795228954
231247306057
241929511720

[263476,265117,201331,204420,209862,295098,427510,
 627452,963880,1514191,2521112,4297857,7398589,
 12871519,22452335,38934291,66781746,113008987,
 188383014,309220327,499665691,795228954,
 1247306057,1929511720]