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.

A243702 Nonnegative numbers represented by the indefinite quadratic form x^2 + 13xy - 9y^2.

Table of values

n a(n)
1 0
2 1
3 4
4 5
5 9
6 16
7 20
8 21
9 25
10 36
11 39
12 45
13 49
14 51
15 59
16 64
17 80
18 81
19 84
20 91
21 100
22 105
23 119
24 121
25 125
26 131
27 139
28 141
29 144
30 156
31 159
32 169
33 180
34 189
35 195
36 196
37 201
38 204
39 221
40 225
41 236
42 241
43 245
44 255
45 256
46 269
47 271
48 279
49 289
50 291
51 295
52 320
53 324
54 329
55 336
56 351
57 359

List of values

[0, 1, 4, 5, 9, 16, 20, 21, 25, 36, 39, 45, 49, 51, 59, 64, 80, 81, 84, 91, 100, 105, 119, 121, 125, 131, 139, 141, 144, 156, 159, 169, 180, 189, 195, 196, 201, 204, 221, 225, 236, 241, 245, 255, 256, 269, 271, 279, 289, 291, 295, 320, 324, 329, 336, 351, 359]