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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.

A337130 a(n) is the sum of all products of pairs of numbers joined by the diagonals of an n-gon when its vertices are numbered from 1 to n in order.

Table of values

n a(n)
1 0
2 0
3 0
4 11
5 40
6 99
7 203
8 370
9 621
10 980
11 1474
12 2133
13 2990
14 4081
15 5445
16 7124
17 9163
18 11610
19 14516
20 17935
21 21924
22 26543
23 31855
24 37926
25 44825
26 52624
27 61398
28 71225
29 82186
30 94365
31 107849
32 122728
33 139095
34 157046
35 176680
36 198099
37 221408
38 246715
39 274131
40 303770

List of values

[0, 0, 0, 11, 40, 99, 203, 370, 621, 980, 1474, 2133, 2990, 4081, 5445, 7124, 9163, 11610, 14516, 17935, 21924, 26543, 31855, 37926, 44825, 52624, 61398, 71225, 82186, 94365, 107849, 122728, 139095, 157046, 176680, 198099, 221408, 246715, 274131, 303770]

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

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