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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.

A165217 Count of interior bounded regions in a regular 2n-sided polygon dissected by all diagonals parallel to sides.

Table of values

n a(n)
3 6
4 25
5 50
6 145
7 224
8 497
9 630
10 1281
11 1606
12 2761
13 3302
14 5265
15 5940
16 9185
17 10472
18 14977
19 16834
20 23161
21 25284
22 34321
23 37720
24 49105
25 53500
26 68225
27 73278
28 92457
29 99470
30 122641
31 131316
32 159681
33 169158
34 204545
35 217210
36 258265
37 273282
38 321937
39 338208
40 396721
41 417380
42 483841
43 507830

List of values

[6, 25, 50, 145, 224, 497, 630, 1281, 1606, 2761, 3302, 5265, 5940, 9185, 10472, 14977, 16834, 23161, 25284, 34321, 37720, 49105, 53500, 68225, 73278, 92457, 99470, 122641, 131316, 159681, 169158, 204545, 217210, 258265, 273282, 321937, 338208, 396721, 417380, 483841, 507830]

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

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