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A065549 as a simple table

na(n)
22
34
48
564
6256
7512
832768
91073741824
1017592186044416
119007199254740992
129223372036854775808
131852673427797059126777135760139006525652319754650249024631321344126610074238976

[2,4,8,64,256,512,32768,1073741824,17592186044416,
 9007199254740992,9223372036854775808,
 18526734277970591267771357601390065256523197546502\
 49024631321344126610074238976]