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A081343 as a simple table

na(n)
01
17
258
3532
45128
550512
6502048
75008192
850032768
9500131072
105000524288
1150002097152
12500008388608
135000033554432
1450000134217728
15500000536870912
165000002147483648
1750000008589934592
18500000034359738368

[1,7,58,532,5128,50512,502048,5008192,50032768,
 500131072,5000524288,50002097152,500008388608,
 5000033554432,50000134217728,500000536870912,
 5000002147483648,50000008589934592,
 500000034359738368]