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A273327 as a simple table

na(n)
01
15
217
361
4257
51073
64433
718161
873937
9299633
101210193
114875761
1219608017
1378746993
14315932753
151266565361

[1,5,17,61,257,1073,4433,18161,73937,299633,
 1210193,4875761,19608017,78746993,315932753,
 1266565361]