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A253914 as a simple table

na(n)
16
218
320
430
566
6258
7260
8732
91026
103130
114098
124100
1316386
1419686
1546662
1665538
1765540
1865552
19262146
20531444
21823550
221048578
231048580
244194306
259765630
2614348910
2716777218
2816777220
2916777224
3067108866
31268435458
32268435460
33387420492
34387420498
351073741826

[6,18,20,30,66,258,260,732,1026,3130,4098,4100,
 16386,19686,46662,65538,65540,65552,262146,531444,
 823550,1048578,1048580,4194306,9765630,14348910,
 16777218,16777220,16777224,67108866,268435458,
 268435460,387420492,387420498,1073741826]