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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.

A272693 a(0)=0; thereafter, a(n) = (A108618(n-1)-3*A108619(n))/2.

Table of values

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

List of values

[0, -1, -2, -5, -4, -3, -3, 0, 5, 2, -3, -6, -7, -5, 2, 9, 4, -5, -10, -9, -3, 6, 11, 5, -10, -21, -12, 5, 14, 9, -5, -19, -17, -4, 15, 16, 1, -15, -21, -12, 11, 20, 9, -11, -25, -17, 2, 21, 16, -5, -22, -21, -3, 18, 23, 5, -22, -33, -15, 18, 35, 17, -22, -45, -24, 17, 38, 21, -17, -43, -29, 8, 39]

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