cp's OEIS Frontend

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.

A324409 Number of achiral polyomino rings of length 4n with fourfold rotational symmetry.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 2
6 4
7 4
8 9
9 9
10 19
11 19
12 42
13 42
14 91
15 91
16 204
17 204
18 448
19 448
20 1007
21 1007
22 2233
23 2233
24 5034
25 5034
26 11242
27 11242
28 25400
29 25400
30 57033
31 57033
32 129127
33 129127
34 291016
35 291016

List of values

[1, 1, 1, 2, 2, 4, 4, 9, 9, 19, 19, 42, 42, 91, 91, 204, 204, 448, 448, 1007, 1007, 2233, 2233, 5034, 5034, 11242, 11242, 25400, 25400, 57033, 57033, 129127, 129127, 291016, 291016]