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A013880 as a simple table

na(n)
04096
14294967296
24503599627370496
34722366482869645213696
44951760157141521099596496896
55192296858534827628530496329220096
65444517870735015415413993718908291383296
75708990770823839524233143877797980545530986496

[4096,4294967296,4503599627370496,
 4722366482869645213696,
 4951760157141521099596496896,
 5192296858534827628530496329220096,
 5444517870735015415413993718908291383296,
 5708990770823839524233143877797980545530986496]