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A078186 as a simple table

na(n)
01
116
265536
368719476736
418446744073709551616
51267650600228229401496703205376
622300745198530623141535718272648361505980416
7100433627766186892221372630771322662657637687111424552206336

[1,16,65536,68719476736,18446744073709551616,
 1267650600228229401496703205376,
 22300745198530623141535718272648361505980416,
 10043362776618689222137263077132266265763768711142\
 4552206336]