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A176362 as a simple table

na(n)
11
27
328
463
5186
6508
71016
82047
96643
1012282
1124564
1265532
13114674
14262136
15786408
161048575
172359278
186815731
1910485740
2025165818
2167108832
22100663284
23201326568
24536870908
251040187361
261879048178
275368709080
288589934584

[1,7,28,63,186,508,1016,2047,6643,12282,24564,
 65532,114674,262136,786408,1048575,2359278,
 6815731,10485740,25165818,67108832,100663284,
 201326568,536870908,1040187361,1879048178,
 5368709080,8589934584]