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.

A258643 Irregular triangle read by rows, n >= 1, k >= 0: T(n,k) is the number of distinct patterns of n X n squares with k holes that are squares (see the construction rule in comments).

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 3
6 1
7 2
8 9
9 7
10 4
11 4
12 5
13 2
14 25
15 11
16 40
17 8
18 33
19 3
20 16
21 0
22 4

List of values

[1, 1, 2, 1, 3, 1, 2, 9, 7, 4, 4, 5, 2, 25, 11, 40, 8, 33, 3, 16, 0, 4]

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

Content is available under The OEIS End-User License Agreement.