cp's OEIS Frontend

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.

A086341 a(n) = 2*2^floor(n/2) - (-1)^n.

Table of values

n a(n)
0 1
1 3
2 3
3 5
4 7
5 9
6 15
7 17
8 31
9 33
10 63
11 65
12 127
13 129
14 255
15 257
16 511
17 513
18 1023
19 1025
20 2047
21 2049
22 4095
23 4097
24 8191
25 8193
26 16383
27 16385
28 32767
29 32769
30 65535
31 65537
32 131071
33 131073
34 262143
35 262145
36 524287
37 524289
38 1048575
39 1048577
40 2097151
41 2097153

List of values

[1, 3, 3, 5, 7, 9, 15, 17, 31, 33, 63, 65, 127, 129, 255, 257, 511, 513, 1023, 1025, 2047, 2049, 4095, 4097, 8191, 8193, 16383, 16385, 32767, 32769, 65535, 65537, 131071, 131073, 262143, 262145, 524287, 524289, 1048575, 1048577, 2097151, 2097153]

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

Content is available under The OEIS End-User License Agreement.