A004870 - OEIS

A004870 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	128
11	129
12	130
13	131
14	132
15	133
16	134
17	135
18	256
19	257
20	258
21	259
22	260
23	261
24	262
25	384
26	385
27	386
28	387
29	388
30	389
31	512
32	513
33	514
34	515
35	516
36	640
37	641
38	642
39	643
40	768
41	769
42	770
43	896
44	897
45	1024
46	2187
47	2188
48	2189
49	2190
50	2191
51	2192
52	2193
53	2194
54	2315

[0,1,2,3,4,5,6,7,8,128,129,130,131,132,133,134, 135,256,257,258,259,260,261,262,384,385,386,387, 388,389,512,513,514,515,516,640,641,642,643,768, 769,770,896,897,1024,2187,2188,2189,2190,2191, 2192,2193,2194,2315]