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A084284 as a simple table

na(n)
11
21
34
438
5727
626538
71832900
8241187797
960807843592
1029307734588670
1126725594885115575

[1,1,4,38,727,26538,1832900,241187797,60807843592,
 29307734588670,26725594885115575]