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A131833 as a simple table

na(n)
01
16
213
324
443
578
6145
7276
8535
91050
102077
114128
128227
1316422
1432809
1565580
16131119
17262194
18524341
191048632
202097211
214194366
228388673
2316777284
2433554503
2567108938
26134217805
27268435536
28536870995
291073741910
302147483737
314294967388
328589934687
3317179869282

[1,6,13,24,43,78,145,276,535,1050,2077,4128,8227,
 16422,32809,65580,131119,262194,524341,1048632,
 2097211,4194366,8388673,16777284,33554503,
 67108938,134217805,268435536,536870995,1073741910,
 2147483737,4294967388,8589934687,17179869282]