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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.

A234248 Number of distinct lines passing through at least three points in a triangular grid of side n.

Table of values

n a(n)
3 3
4 6
5 12
6 21
7 36
8 57
9 90
10 129
11 186
12 261
13 354
14 465
15 612
16 783
17 990
18 1233
19 1524
20 1863
21 2262
22 2703
23 3216
24 3801
25 4458
26 5187
27 6024
28 6951
29 7986
30 9129
31 10392
32 11775
33 13302
34 14943
35 16746
36 18711
37 20844
38 23145
39 25668
40 28377
41 31296
42 34425
43 37782
44 41367
45 45210
46 49287

List of values

[3, 6, 12, 21, 36, 57, 90, 129, 186, 261, 354, 465, 612, 783, 990, 1233, 1524, 1863, 2262, 2703, 3216, 3801, 4458, 5187, 6024, 6951, 7986, 9129, 10392, 11775, 13302, 14943, 16746, 18711, 20844, 23145, 25668, 28377, 31296, 34425, 37782, 41367, 45210, 49287]

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

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