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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A273672 Permutation of natural numbers induced by looking up the position of fraction A270418(n)/A270419(n) from the full Stern-Brocot tree A007305(n+1)/A047679(n-1).

Table of values

n a(n)
1 1
2 3
3 7
4 15
5 31
6 63
7 127
8 2
9 511
10 1023
11 2047
12 4095
13 8191
14 16383
15 32767
16 65535
17 131071
18 262143
19 524287
20 1048575
21 2097151
22 4194303
23 8388607
24 6
25 33554431
26 67108863
27 4
28 268435455
29 536870911
30 1073741823
31 2147483647
32 128
33 8589934591
34 17179869183
35 34359738367
36 68719476735
37 137438953471
38 274877906943
39 549755813887
40 14

List of values

[1, 3, 7, 15, 31, 63, 127, 2, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575, 2097151, 4194303, 8388607, 6, 33554431, 67108863, 4, 268435455, 536870911, 1073741823, 2147483647, 128, 8589934591, 17179869183, 34359738367, 68719476735, 137438953471, 274877906943, 549755813887, 14]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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