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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.

A317419 a(n) = number of k with 1 <= k <= n-1 such that a(k) AND a(n-k) = 0 (where AND denotes the bitwise AND operator).

Table of values

n a(n)
1 0
2 1
3 2
4 2
5 4
6 4
7 4
8 6
9 8
10 8
11 6
12 6
13 8
14 8
15 8
16 10
17 12
18 12
19 10
20 14
21 20
22 14
23 8
24 10
25 12
26 12
27 8
28 8
29 12
30 14
31 14
32 10
33 10
34 12
35 12
36 8
37 10
38 14
39 16
40 12
41 6
42 10
43 12
44 14
45 8
46 8
47 12
48 14
49 14
50 14
51 14
52 10
53 12
54 12
55 8
56 12
57 18
58 16
59 12
60 8
61 10
62 14
63 18
64 14
65 10
66 18
67 18
68 16
69 12
70 14
71 18

List of values

[0, 1, 2, 2, 4, 4, 4, 6, 8, 8, 6, 6, 8, 8, 8, 10, 12, 12, 10, 14, 20, 14, 8, 10, 12, 12, 8, 8, 12, 14, 14, 10, 10, 12, 12, 8, 10, 14, 16, 12, 6, 10, 12, 14, 8, 8, 12, 14, 14, 14, 14, 10, 12, 12, 8, 12, 18, 16, 12, 8, 10, 14, 18, 14, 10, 18, 18, 16, 12, 14, 18]

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

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