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A167436 as a simple table

na(n)
12
217
3730
465537
59765626
62176782337
7678223072850
8281474976710657
9150094635296999122
10100000000000000000001
1181402749386839761113322
1279496847203390844133441537
1391733330193268616658399616010

[2,17,730,65537,9765626,2176782337,678223072850,
 281474976710657,150094635296999122,
 100000000000000000001,81402749386839761113322,
 79496847203390844133441537,
 91733330193268616658399616010]