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A117863 as a simple table

na(n)
13
26
318
430
578
6126
7318
8510
91278
102046
115118
128190
1320478
1432766
1581918
16131070
17327678
18524286
191310718
202097150
215242878
228388606
2320971518
2433554430
2583886078
26134217726
27335544318
28536870910
291342177278
302147483646
315368709118
328589934590

[3,6,18,30,78,126,318,510,1278,2046,5118,8190,
 20478,32766,81918,131070,327678,524286,1310718,
 2097150,5242878,8388606,20971518,33554430,
 83886078,134217726,335544318,536870910,1342177278,
 2147483646,5368709118,8589934590]