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A252521 as a simple table

na(n)
11471
25214
321510
447308
5268555
61215491
72662952
815755867
973792188
10160605830
11977103095
124668722734
1310119572634
1462609075589
15302574704284
16654293895244
174086229186201
1819870347822346
1942913053749386

[1471,5214,21510,47308,268555,1215491,2662952,
 15755867,73792188,160605830,977103095,4668722734,
 10119572634,62609075589,302574704284,654293895244,
 4086229186201,19870347822346,42913053749386]