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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.

A008287 Triangle of quadrinomial coefficients, row n is the sequence of coefficients of (1 + x + x^2 + x^3)^n.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 2
7 3
8 4
9 3
10 2
11 1
12 1
13 3
14 6
15 10
16 12
17 12
18 10
19 6
20 3
21 1
22 1
23 4
24 10
25 20
26 31
27 40
28 44
29 40
30 31
31 20
32 10
33 4
34 1
35 1
36 5
37 15
38 35
39 65
40 101
41 135
42 155
43 155
44 135
45 101
46 65
47 35
48 15
49 5
50 1
51 1
52 6
53 21
54 56
55 120
56 216
57 336
58 456
59 546
60 580
61 546
62 456
63 336
64 216
65 120
66 56
67 21
68 6
69 1

List of values

[1, 1, 1, 1, 1, 1, 2, 3, 4, 3, 2, 1, 1, 3, 6, 10, 12, 12, 10, 6, 3, 1, 1, 4, 10, 20, 31, 40, 44, 40, 31, 20, 10, 4, 1, 1, 5, 15, 35, 65, 101, 135, 155, 155, 135, 101, 65, 35, 15, 5, 1, 1, 6, 21, 56, 120, 216, 336, 456, 546, 580, 546, 456, 336, 216, 120, 56, 21, 6, 1]

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

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