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A220574 as a simple table

na(n)
14
221
391
4375
51487
65835
722775
888683
9344975
101341395
115214791
1220271307
1378797247
14306290211
151190562423
164627750267
1717988173039
1869920406547
19271782019879
201056422029931
214106332901663
2215961395217283
2362042250575063

[4,21,91,375,1487,5835,22775,88683,344975,1341395,
 5214791,20271307,78797247,306290211,1190562423,
 4627750267,17988173039,69920406547,271782019879,
 1056422029931,4106332901663,15961395217283,
 62042250575063]