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A201491 as a simple table

na(n)
15
2226
39331
4301432
57798656
6168357815
73127432827
851118964623
9747555368709
109907361072523
11120219907134113
121346895312283777
1314030077787811997
14136685387878719346
151251770455347161910
1610823892860244631974

[5,226,9331,301432,7798656,168357815,3127432827,
 51118964623,747555368709,9907361072523,
 120219907134113,1346895312283777,
 14030077787811997,136685387878719346,
 1251770455347161910,10823892860244631974]