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A074073 as a simple table

na(n)
01
14
28
3256
432768
54294967296
69223372036854775808
7340282366920938463463374607431768211456
857896044618658097711785492504343953926634992332820282019728792003956564819968

[1,4,8,256,32768,4294967296,9223372036854775808,
 340282366920938463463374607431768211456,
 57896044618658097711785492504343953926634992332820\
 282019728792003956564819968]