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A251986 as a simple table

na(n)
120011
2231559
33069283
443957515
5663814741
610354206421
7164646337261
82648489572393
942891326673193
10697320655791303
1111362478125413003
12185385704533268171
133026933091644568399
1449444184724604712255

[20011,231559,3069283,43957515,663814741,
 10354206421,164646337261,2648489572393,
 42891326673193,697320655791303,11362478125413003,
 185385704533268171,3026933091644568399,
 49444184724604712255]