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A017555 as a simple table

na(n)
02048
14049565169664
23670344486987776
3238572050223552512
44882812500000000000
552036560683837093888
6364375289404334925824
71903193578437064103936
88007313507497959524352
928531167061100000000000

[2048,4049565169664,3670344486987776,
 238572050223552512,4882812500000000000,
 52036560683837093888,364375289404334925824,
 1903193578437064103936,8007313507497959524352,
 28531167061100000000000]