login

A166920 as a simple table

na(n)
00
12
23
38
415
532
663
7128
8255
9512
101023
112048
124095
138192
1416383
1532768
1665535
17131072
18262143
19524288
201048575
212097152
224194303
238388608
2416777215
2533554432
2667108863
27134217728
28268435455
29536870912
301073741823
312147483648
324294967295

[0,2,3,8,15,32,63,128,255,512,1023,2048,4095,8192,
 16383,32768,65535,131072,262143,524288,1048575,
 2097152,4194303,8388608,16777215,33554432,
 67108863,134217728,268435455,536870912,1073741823,
 2147483648,4294967295]