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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.

A277949 Triangle read by rows, in which row n gives coefficients in expansion of ((x^n - 1)/(x - 1))^4.

Table of values

n a(n)
1 1
2 1
3 4
4 6
5 4
6 1
7 1
8 4
9 10
10 16
11 19
12 16
13 10
14 4
15 1
16 1
17 4
18 10
19 20
20 31
21 40
22 44
23 40
24 31
25 20
26 10
27 4
28 1
29 1
30 4
31 10
32 20
33 35
34 52
35 68
36 80
37 85
38 80
39 68
40 52
41 35
42 20
43 10
44 4
45 1
46 1
47 4
48 10
49 20
50 35
51 56
52 80
53 104
54 125
55 140
56 146
57 140
58 125
59 104
60 80
61 56
62 35
63 20
64 10
65 4
66 1

List of values

[1, 1, 4, 6, 4, 1, 1, 4, 10, 16, 19, 16, 10, 4, 1, 1, 4, 10, 20, 31, 40, 44, 40, 31, 20, 10, 4, 1, 1, 4, 10, 20, 35, 52, 68, 80, 85, 80, 68, 52, 35, 20, 10, 4, 1, 1, 4, 10, 20, 35, 56, 80, 104, 125, 140, 146, 140, 125, 104, 80, 56, 35, 20, 10, 4, 1]

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

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