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A295904 as a simple table

na(n)
16
212
320
432
552
688
7156
8288
9548
101064
112092
124144
138244
1416440
1532828
1665600
17131140
18262216
19524364
201048656
212097236
224194392
238388700
2416777312
2533554532
2667108968
27134217836
28268435568
29536871028
301073741944
312147483772
324294967424
338589934724

[6,12,20,32,52,88,156,288,548,1064,2092,4144,8244,
 16440,32828,65600,131140,262216,524364,1048656,
 2097236,4194392,8388700,16777312,33554532,
 67108968,134217836,268435568,536871028,1073741944,
 2147483772,4294967424,8589934724]