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A139257 as a simple table

na(n)
16
214
362
4254
516382
6262142
71048574
84294967294
94611686018427387902
101237940039285380274899124222
11324518553658426726783156020576254
12340282366920938463463374607431768211454

[6,14,62,254,16382,262142,1048574,4294967294,
 4611686018427387902,1237940039285380274899124222,
 324518553658426726783156020576254,
 340282366920938463463374607431768211454]