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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.

A140875 Triangle read by rows: T(n,m) = gcd(n,m+2) - 2*gcd(n,m+1) - gcd(n,m), with diagonal and subdiagonal removed.

Table of values

n a(n)
1 -2
2 -4
3 0
4 -4
5 -4
6 0
7 -6
8 -2
9 -2
10 2
11 -6
12 -2
13 -6
14 -6
15 2
16 -8
17 -2
18 -2
19 -2
20 -2
21 4
22 -8
23 -4
24 0
25 -8
26 -4
27 -4
28 4
29 -10
30 0
31 -6
32 -4
33 0
34 -6
35 -4
36 6
37 -10
38 -4
39 -2
40 0
41 -10
42 -8
43 -2
44 -4
45 6
46 -12
47 -2
48 -2
49 -2
50 -2
51 -2
52 -2
53 -2
54 -2
55 8
56 -12
57 -2
58 -4
59 -10
60 0
61 -12
62 -4
63 -6
64 -8
65 -6
66 8
67 -14
68 -2
69 -2
70 -2
71 -2
72 -2
73 -2
74 -2
75 -2
76 -2
77 -2
78 10

List of values

[-2, -4, 0, -4, -4, 0, -6, -2, -2, 2, -6, -2, -6, -6, 2, -8, -2, -2, -2, -2, 4, -8, -4, 0, -8, -4, -4, 4, -10, 0, -6, -4, 0, -6, -4, 6, -10, -4, -2, 0, -10, -8, -2, -4, 6, -12, -2, -2, -2, -2, -2, -2, -2, -2, 8, -12, -2, -4, -10, 0, -12, -4, -6, -8, -6, 8, -14, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 10]

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

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