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A306899 as a simple table

na(n)
16
212
336
448
590
6180
7294
8576
91134
102160
114158
128496
1316458
1433096
1565880
16131712
17262242
18525852
191048686
202099520
214195296
228392824
2316777350
2433564672
2567109250
26134234256
27268438860
28536904480
291073741994
302147556240
314294967478
328590066944

[6,12,36,48,90,180,294,576,1134,2160,4158,8496,
 16458,33096,65880,131712,262242,525852,1048686,
 2099520,4195296,8392824,16777350,33564672,
 67109250,134234256,268438860,536904480,1073741994,
 2147556240,4294967478,8590066944]