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A257449 as a simple table

na(n)
11
217
399
4373
51115
62901
76907
815509
933483
1070405
11145451
12296997
13601819
141213493
152439195
164893301
179804587
1819630629
1939286603
2078602885
21157240251
22314520277
23629086139
241258224213
252516507275
265033080901
2710066236267
2820132555749
2940265204123

[1,17,99,373,1115,2901,6907,15509,33483,70405,
 145451,296997,601819,1213493,2439195,4893301,
 9804587,19630629,39286603,78602885,157240251,
 314520277,629086139,1258224213,2516507275,
 5033080901,10066236267,20132555749,40265204123]