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A303963 as a simple table

na(n)
12
25
39
421
553
6105
7237
8577
91205
102681
116349
1213681
1330309
1470377
15154429
16342177
17783957
181737881
193857581
208760529
2119527749
2243436873
2398090781
24219270657
25488654645
261099633401
272461435533
285493590065
2912336038693
3027628989353

[2,5,9,21,53,105,237,577,1205,2681,6349,13681,
 30309,70377,154429,342177,783957,1737881,3857581,
 8760529,19527749,43436873,98090781,219270657,
 488654645,1099633401,2461435533,5493590065,
 12336038693,27628989353]