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A064089 as a simple table

na(n)
01
11
27
385
41279
521517
6387607
77312789
8142648495
92853691357
1058226571271
111207062556261
1225351452769567
13538285926177325
1411535690316148215
15249189167966657845
165420206822556721295

[1,1,7,85,1279,21517,387607,7312789,142648495,
 2853691357,58226571271,1207062556261,
 25351452769567,538285926177325,11535690316148215,
 249189167966657845,5420206822556721295]