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.

A269143 T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 4
2 16
3 16
4 60
5 148
6 60
7 216
8 1164
9 1164
10 216
11 756
12 8532
13 18556
14 8532
15 756
16 2592
17 59916
18 275796
19 275796
20 59916
21 2592
22 8748
23 408596
24 3924212
25 8317996
26 3924212
27 408596
28 8748
29 29160
30 2727564
31 54199284
32 240647068
33 240647068
34 54199284
35 2727564
36 29160

List of values

[4, 16, 16, 60, 148, 60, 216, 1164, 1164, 216, 756, 8532, 18556, 8532, 756, 2592, 59916, 275796, 275796, 59916, 2592, 8748, 408596, 3924212, 8317996, 3924212, 408596, 8748, 29160, 2727564, 54199284, 240647068, 240647068, 54199284, 2727564, 29160]

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

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