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A220236 as a simple table

na(n)
19
251
3231
4975
53999
616191
765151
8261375
91047039
104191231
1116771071
1267096575
13268410879
141073692671
154294868991
1617179672575
1768719083519
18274877120511
191099510054911
204398043365375
2117592179752959
2270368731594751
23281474951544831
241125899856510975

[9,51,231,975,3999,16191,65151,261375,1047039,
 4191231,16771071,67096575,268410879,1073692671,
 4294868991,17179672575,68719083519,274877120511,
 1099510054911,4398043365375,17592179752959,
 70368731594751,281474951544831,1125899856510975]