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A120778 as a simple table

na(n)
01
15
211
393
4193
5793
61619
726333
853381
9215955
10436109
113518265
127088533
1328539857
1457414019
151846943453
163711565741
1714911085359
1829941580393
19240416274739
20482473579583
211936010885087
223883457090629
2362306843256889

[1,5,11,93,193,793,1619,26333,53381,215955,436109,
 3518265,7088533,28539857,57414019,1846943453,
 3711565741,14911085359,29941580393,240416274739,
 482473579583,1936010885087,3883457090629,
 62306843256889]