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A130624 as a simple table

na(n)
00
11
25
312
423
543
684
7169
8341
9684
101367
112731
125460
1310921
1421845
1543692
1687383
17174763
18349524
19699049
201398101
212796204
225592407
2311184811
2422369620
2544739241
2689478485
27178956972
28357913943
29715827883
301431655764
312863311529
325726623061
3311453246124

[0,1,5,12,23,43,84,169,341,684,1367,2731,5460,
 10921,21845,43692,87383,174763,349524,699049,
 1398101,2796204,5592407,11184811,22369620,
 44739241,89478485,178956972,357913943,715827883,
 1431655764,2863311529,5726623061,11453246124]