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A224080 as a simple table

na(n)
11
21
34
425
5231
62701
738963
8662929
913037608
10290586301
117241964357
12199511192233
136020966627261
14197526938563501
156999280556977816
16266408120037084577
1710840080711977589375
18469561023814159909981
1921573682777922810043335
201047866254345761285979321

[1,1,4,25,231,2701,38963,662929,13037608,
 290586301,7241964357,199511192233,6020966627261,
 197526938563501,6999280556977816,
 266408120037084577,10840080711977589375,
 469561023814159909981,21573682777922810043335,
 1047866254345761285979321]