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A218658 as a simple table

na(n)
15
257
3417
43249
525533
6199489
71560161
812202673
995434773
10746388537
115837454753
1245654295713
13357058903853
142792531543489
1521840184444225
16170810481722657
171335896257560101
1810447946710663673
1981712625405191841

[5,57,417,3249,25533,199489,1560161,12202673,
 95434773,746388537,5837454753,45654295713,
 357058903853,2792531543489,21840184444225,
 170810481722657,1335896257560101,
 10447946710663673,81712625405191841]