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A274671 as a simple table

na(n)
01
15
249
3593
47921
5111965
61641865
724705665
8378931585
95898329045
1092893693729
111477015762865
1223671209428881
13381902943661517
146196712221450009
15101043805539177473
161654726991239056385
1727201210101330189477
18448652354194417534609
197422254208909904273553

[1,5,49,593,7921,111965,1641865,24705665,
 378931585,5898329045,92893693729,1477015762865,
 23671209428881,381902943661517,6196712221450009,
 101043805539177473,1654726991239056385,
 27201210101330189477,448652354194417534609,
 7422254208909904273553]