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A060656 as a simple table

na(n)
01
11
22
34
416
564
6512
74096
865536
91048576
1033554432
111073741824
1268719476736
134398046511104
14562949953421312
1572057594037927936
1618446744073709551616
174722366482869645213696
182417851639229258349412352

[1,1,2,4,16,64,512,4096,65536,1048576,33554432,
 1073741824,68719476736,4398046511104,
 562949953421312,72057594037927936,
 18446744073709551616,4722366482869645213696,
 2417851639229258349412352]