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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.

A117716 Triangle T(n,k) read by rows: the coefficient [x^n] of x^2/(1-(k+1)*x-x^3) in row n, columns 0 <= k <= n.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 1
5 1
6 1
7 2
8 3
9 4
10 1
11 4
12 9
13 16
14 25
15 2
16 9
17 28
18 65
19 126
20 217
21 3
22 20
23 87
24 264
25 635
26 1308
27 2415
28 4
29 44
30 270
31 1072
32 3200
33 7884
34 16954
35 32960
36 6
37 97
38 838
39 4353
40 16126
41 47521
42 119022
43 264193
44 534358
45 9
46 214
47 2601
48 17676
49 81265
50 286434
51 835569
52 2117656
53 4815801
54 10050030

List of values

[0, 0, 0, 1, 1, 1, 1, 2, 3, 4, 1, 4, 9, 16, 25, 2, 9, 28, 65, 126, 217, 3, 20, 87, 264, 635, 1308, 2415, 4, 44, 270, 1072, 3200, 7884, 16954, 32960, 6, 97, 838, 4353, 16126, 47521, 119022, 264193, 534358, 9, 214, 2601, 17676, 81265, 286434, 835569, 2117656, 4815801, 10050030]

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

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