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.

A072732 Simple triangle-stretching N X N -> N bijection: push terms in the middle twice as far down to make space for the terms obtained by bisecting the edges, which are thus contracted by the same factor. Do this for all "triangle-shells" successively contained inside each other in A001477.

Table of values

n a(n)
0 0
1 1
2 4
3 7
4 12
5 2
6 3
7 17
8 24
9 8
10 11
11 31
12 40
13 18
14 5
15 6
16 23
17 49
18 60
19 32
20 13
21 16
22 39
23 71
24 84
25 50
26 25
27 9
28 10
29 30
30 59
31 97
32 112
33 72
34 41
35 19
36 22
37 48
38 83
39 127
40 144
41 98
42 61
43 33
44 14
45 15
46 38
47 70
48 111
49 161
50 180
51 128
52 85
53 51
54 26
55 29
56 58
57 96
58 143
59 199
60 220
61 162
62 113
63 73
64 42
65 20
66 21
67 47

List of values

[0, 1, 4, 7, 12, 2, 3, 17, 24, 8, 11, 31, 40, 18, 5, 6, 23, 49, 60, 32, 13, 16, 39, 71, 84, 50, 25, 9, 10, 30, 59, 97, 112, 72, 41, 19, 22, 48, 83, 127, 144, 98, 61, 33, 14, 15, 38, 70, 111, 161, 180, 128, 85, 51, 26, 29, 58, 96, 143, 199, 220, 162, 113, 73, 42, 20, 21, 47]