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A017704 as a simple table

na(n)
11
21048576
33486784401
41099511627776
595367431640625
61828079220031488
779792266297612001
81152921504606846976
912157665459056928801
1050000000000000000000
11672749994932560009201
12638959998741245853696

[1,1048576,3486784401,1099511627776,
 95367431640625,1828079220031488,79792266297612001,
 1152921504606846976,12157665459056928801,
 50000000000000000000,672749994932560009201,
 638959998741245853696]