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A013822 as a simple table

na(n)
02
164
22048
365536
42097152
567108864
62147483648
768719476736
82199023255552
970368744177664
102251799813685248
1172057594037927936
122305843009213693952
1373786976294838206464
142361183241434822606848

[2,64,2048,65536,2097152,67108864,2147483648,
 68719476736,2199023255552,70368744177664,
 2251799813685248,72057594037927936,
 2305843009213693952,73786976294838206464,
 2361183241434822606848]