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A131952 as a simple table

na(n)
12047
28388607
31082401
43277
5536870911
68727391
74033
8137438953471
99588151
102199023255551
118796093022207
12838861
1314709241
14140737488355327
1565281
161016801
172454285751
1813421773
199007199254740991
20567767102431
2139268347319
22178956971
23576460752303423487
2480581

[2047,8388607,1082401,3277,536870911,8727391,4033,
 137438953471,9588151,2199023255551,8796093022207,
 838861,14709241,140737488355327,65281,1016801,
 2454285751,13421773,9007199254740991,567767102431,
 39268347319,178956971,576460752303423487,80581]