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A320860 as a simple table

na(n)
14
24096
34194304
44294967296
54398046511104
64503599627370496
74611686018427387904
84722366482869645213696
94835703278458516698824704
104951760157141521099596496896
1140564819207303340847894502572032
1241538374868278621028243970633760768

[4,4096,4194304,4294967296,4398046511104,
 4503599627370496,4611686018427387904,
 4722366482869645213696,4835703278458516698824704,
 4951760157141521099596496896,
 40564819207303340847894502572032,
 41538374868278621028243970633760768]