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.

A378169 Number of free polyominoes with n cells with at most 3 collinear cell centers on any line in the plane.

Table of values

n a(n)
1 1
2 1
3 2
4 4
5 9
6 18
7 37
8 62
9 86
10 78
11 61
12 34
13 14
14 4
15 1

List of values

[1, 1, 2, 4, 9, 18, 37, 62, 86, 78, 61, 34, 14, 4, 1]