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A017490 as a simple table

na(n)
0262144
147045881
2729000000
34750104241
419770609664
562523502209
6164206490176
7377149515625
8782757789696
91500730351849
102699554153024
114608273662721
127529536000000
1311853911588401
1418075490334784
1526808753332089
1638806720086016
1754980371265625

[262144,47045881,729000000,4750104241,19770609664,
 62523502209,164206490176,377149515625,
 782757789696,1500730351849,2699554153024,
 4608273662721,7529536000000,11853911588401,
 18075490334784,26808753332089,38806720086016,
 54980371265625]