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A304385 as a simple table

na(n)
1353
2737
31505
43041
56113
612257
724545
849121
998273
10196577
11393185
12786401
131572833
143145697
156291425
1612582881
1725165793
1850331617
19100663265
20201326561
21402653153
22805306337
231610612705
243221225441
256442450913
2612884901857
2725769803745
2851539607521

[353,737,1505,3041,6113,12257,24545,49121,98273,
 196577,393185,786401,1572833,3145697,6291425,
 12582881,25165793,50331617,100663265,201326561,
 402653153,805306337,1610612705,3221225441,
 6442450913,12884901857,25769803745,51539607521]