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A206878 as a simple table

na(n)
17
249
3230
41011
54705
622412
7105936
8497727
92339729
1011013295
1151846666
12244013222
131148355280
145404522372
1525435928407
16119711433603
17563405871570
182651594982047
1912479394172896
2058732688555813
21276417903263710

[7,49,230,1011,4705,22412,105936,497727,2339729,
 11013295,51846666,244013222,1148355280,5404522372,
 25435928407,119711433603,563405871570,
 2651594982047,12479394172896,58732688555813,
 276417903263710]