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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.

A177723 Number of line segments connecting exactly 7 points in an n X n grid of points.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 16
8 40
9 72
10 112
11 160
12 216
13 308
14 416
15 540
16 680
17 836
18 1008
19 1276
20 1576
21 1908
22 2272
23 2668
24 3096
25 3660
26 4272
27 4932
28 5640
29 6396
30 7200
31 8308
32 9496
33 10764
34 12112
35 13540
36 15048
37 16788
38 18624
39 20556
40 22584
41 24708
42 26928
43 29772
44 32760

List of values

[0, 0, 0, 0, 0, 0, 16, 40, 72, 112, 160, 216, 308, 416, 540, 680, 836, 1008, 1276, 1576, 1908, 2272, 2668, 3096, 3660, 4272, 4932, 5640, 6396, 7200, 8308, 9496, 10764, 12112, 13540, 15048, 16788, 18624, 20556, 22584, 24708, 26928, 29772, 32760]

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

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