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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.

A307519 a(n) is the number of canonical polygons with 4n edges having exactly 4 lines of reflection symmetry.

Table of values

n a(n)
1 2
2 1
3 2
4 6
5 10
6 17
7 34
8 72
9 142
10 288
11 585
12 1195
13 2413
14 4898

List of values

[2, 1, 2, 6, 10, 17, 34, 72, 142, 288, 585, 1195, 2413, 4898]