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.

A138341 Expansion of (1-4x-x^3)/(1-x+x^2)^2.

Table of values

n a(n)
0 1
1 -2
2 -7
3 -7
4 2
5 13
6 13
7 -2
8 -19
9 -19
10 2
11 25
12 25
13 -2
14 -31
15 -31
16 2
17 37
18 37
19 -2
20 -43
21 -43
22 2
23 49
24 49
25 -2
26 -55
27 -55
28 2
29 61
30 61
31 -2
32 -67
33 -67
34 2
35 73
36 73
37 -2
38 -79
39 -79
40 2
41 85
42 85
43 -2
44 -91
45 -91
46 2
47 97
48 97
49 -2
50 -103
51 -103
52 2
53 109
54 109
55 -2
56 -115
57 -115
58 2
59 121
60 121
61 -2

List of values

[1, -2, -7, -7, 2, 13, 13, -2, -19, -19, 2, 25, 25, -2, -31, -31, 2, 37, 37, -2, -43, -43, 2, 49, 49, -2, -55, -55, 2, 61, 61, -2, -67, -67, 2, 73, 73, -2, -79, -79, 2, 85, 85, -2, -91, -91, 2, 97, 97, -2, -103, -103, 2, 109, 109, -2, -115, -115, 2, 121, 121, -2]