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A056854 as a simple table

na(n)
02
17
247
3322
42207
515127
6103682
7710647
84870847
933385282
10228826127
111568397607
1210749957122
1373681302247
14505019158607
153461452808002
1623725150497407
17162614600673847
181114577054219522
197639424778862807
2052361396397820127
21358890350005878082
222459871053643326447

[2,7,47,322,2207,15127,103682,710647,4870847,
 33385282,228826127,1568397607,10749957122,
 73681302247,505019158607,3461452808002,
 23725150497407,162614600673847,1114577054219522,
 7639424778862807,52361396397820127,
 358890350005878082,2459871053643326447]