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.

A351159 Number of polyominoes of n cells with both diagonal symmetries, for which the 180-degree rotational symmetry has an axis that coincides with the center of a square, but without 90-degree rotational symmetry.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 0
9 0
10 0
11 2
12 1
13 3
14 1
15 6
16 4
17 9
18 6
19 20
20 19
21 32
22 25
23 64
24 82
25 114
26 107
27 217
28 332
29 397
30 442
31 751
32 1316

List of values

[0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 1, 3, 1, 6, 4, 9, 6, 20, 19, 32, 25, 64, 82, 114, 107, 217, 332, 397, 442, 751, 1316]

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

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