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A250847 as a simple table

na(n)
1400
22457
313097
463631
5291165
61280447
75480917
823024631
995448605
10391939087
111598379237
126485763431
1326220548845
14105716192127
15425369781557
161709000211031
176858576189885
1827502054979567
19110211518943877

[400,2457,13097,63631,291165,1280447,5480917,
 23024631,95448605,391939087,1598379237,6485763431,
 26220548845,105716192127,425369781557,
 1709000211031,6858576189885,27502054979567,
 110211518943877]