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.

A349813 Triangle read by rows: row 1 is [3]; for n >= 1, row n gives coefficients of expansion of (-3 - x + x^2 + 3*x^3)*(1 + x + x^2 + x^3)^(n-1) in order of increasing powers of x.

Table of values

n a(n)
0 3
1 -3
2 -1
3 1
4 3
5 -3
6 -4
7 -3
8 0
9 3
10 4
11 3
12 -3
13 -7
14 -10
15 -10
16 -4
17 4
18 10
19 10
20 7
21 3
22 -3
23 -10
24 -20
25 -30
26 -31
27 -20
28 0
29 20
30 31
31 30
32 20
33 10
34 3
35 -3
36 -13
37 -33
38 -63
39 -91
40 -101
41 -81
42 -31
43 31
44 81
45 101
46 91
47 63
48 33
49 13
50 3
51 -3
52 -16
53 -49
54 -112
55 -200
56 -288
57 -336
58 -304
59 -182
60 0
61 182
62 304
63 336
64 288
65 200
66 112
67 49
68 16
69 3

List of values

[3, -3, -1, 1, 3, -3, -4, -3, 0, 3, 4, 3, -3, -7, -10, -10, -4, 4, 10, 10, 7, 3, -3, -10, -20, -30, -31, -20, 0, 20, 31, 30, 20, 10, 3, -3, -13, -33, -63, -91, -101, -81, -31, 31, 81, 101, 91, 63, 33, 13, 3, -3, -16, -49, -112, -200, -288, -336, -304, -182, 0, 182, 304, 336, 288, 200, 112, 49, 16, 3]