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A099393 as a simple table

na(n)
01
15
219
371
4271
51055
64159
716511
865791
9262655
101049599
114196351
1216781311
1367117055
14268451839
151073774591
164295032831
1717180000255
1868719738879
19274878431231
201099512676351
214398048608255
2217592190238719

[1,5,19,71,271,1055,4159,16511,65791,262655,
 1049599,4196351,16781311,67117055,268451839,
 1073774591,4295032831,17180000255,68719738879,
 274878431231,1099512676351,4398048608255,
 17592190238719]