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A251476 as a simple table

na(n)
1586
23904
324182
4123739
5609565
62696488
711697274
847575204
9191527226
10740673411
112848714884
1210679966309
1339919058437
14146791696499
15538812135978
161957471091980
177102211736792
1825606426267704
1992214319488546

[586,3904,24182,123739,609565,2696488,11697274,
 47575204,191527226,740673411,2848714884,
 10679966309,39919058437,146791696499,538812135978,
 1957471091980,7102211736792,25606426267704,
 92214319488546]