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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.

A246830 T(n,k) is the concatenation of n-k and n+k in binary; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

n a(n)
0 0
1 3
2 2
3 10
4 7
5 4
6 15
7 20
8 13
9 6
10 36
11 29
12 22
13 15
14 8
15 45
16 38
17 31
18 40
19 25
20 10
21 54
22 47
23 72
24 57
25 42
26 27
27 12
28 63
29 104
30 89
31 74
32 59
33 44
34 29
35 14
36 136
37 121
38 106
39 91
40 76
41 61
42 46
43 31
44 16
45 153
46 138
47 123
48 108
49 93
50 78
51 63
52 80
53 49
54 18
55 170
56 155
57 140
58 125
59 110
60 95
61 144
62 113
63 82
64 51
65 20

List of values

[0, 3, 2, 10, 7, 4, 15, 20, 13, 6, 36, 29, 22, 15, 8, 45, 38, 31, 40, 25, 10, 54, 47, 72, 57, 42, 27, 12, 63, 104, 89, 74, 59, 44, 29, 14, 136, 121, 106, 91, 76, 61, 46, 31, 16, 153, 138, 123, 108, 93, 78, 63, 80, 49, 18, 170, 155, 140, 125, 110, 95, 144, 113, 82, 51, 20]

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

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