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A166456 as a simple table

na(n)
01
12
26
312
430
560
6124
7248
8510
91020
102044
114088
128188
1316376
1432760
1565520
16131070
17262140
18524284
191048568
202097148
214194296
228388600
2316777200
2433554428
2567108856
26134217720
27268435440
28536870904
291073741808
302147483632
314294967264
328589934590
3317179869180

[1,2,6,12,30,60,124,248,510,1020,2044,4088,8188,
 16376,32760,65520,131070,262140,524284,1048568,
 2097148,4194296,8388600,16777200,33554428,
 67108856,134217720,268435440,536870904,1073741808,
 2147483632,4294967264,8589934590,17179869180]