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A084120 as a simple table

na(n)
01
13
215
381
4441
52403
613095
771361
8388881
92119203
1011548575
1162933841
12342957321
131868942403
1410184782455
1555501867521
16302456857761
171648235544003
188982042690735
1948947549512401
20266739169002201

[1,3,15,81,441,2403,13095,71361,388881,2119203,
 11548575,62933841,342957321,1868942403,
 10184782455,55501867521,302456857761,
 1648235544003,8982042690735,48947549512401,
 266739169002201]