A004894 - OEIS

A004894 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	9
11	10
12	512
13	513
14	514
15	515
16	516
17	517
18	518
19	519
20	520
21	521
22	1024
23	1025
24	1026
25	1027
26	1028
27	1029
28	1030
29	1031
30	1032
31	1536
32	1537
33	1538
34	1539
35	1540
36	1541
37	1542
38	1543
39	2048
40	2049
41	2050
42	2051

[0,1,2,3,4,5,6,7,8,9,10,512,513,514,515,516,517, 518,519,520,521,1024,1025,1026,1027,1028,1029, 1030,1031,1032,1536,1537,1538,1539,1540,1541,1542, 1543,2048,2049,2050,2051]