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A271637 as a simple table

na(n)
16
2820
3104391567
4119304648
5858993460
6900719925474100
726202761468337432
829478106651879611
932753451835421790
10225701339254799219773
11243062980735937621294
12260424622217076022815
13277786263698214424336
14944473296573929042740
15232485734541274841289650

[6,820,104391567,119304648,858993460,
 900719925474100,26202761468337432,
 29478106651879611,32753451835421790,
 225701339254799219773,243062980735937621294,
 260424622217076022815,277786263698214424336,
 944473296573929042740,232485734541274841289650]