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.

A269186 T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 0
2 4
3 4
4 24
5 48
6 24
7 108
8 384
9 384
10 108
11 432
12 2736
13 5888
14 2736
15 432
16 1620
17 18336
18 80112
19 80112
20 18336
21 1620
22 5832
23 118032
24 1031344
25 2097552
26 1031344
27 118032
28 5832
29 20412
30 739008
31 12791896
32 52394312
33 52394312
34 12791896
35 739008
36 20412
37 69984
38 4533744

List of values

[0, 4, 4, 24, 48, 24, 108, 384, 384, 108, 432, 2736, 5888, 2736, 432, 1620, 18336, 80112, 80112, 18336, 1620, 5832, 118032, 1031344, 2097552, 1031344, 118032, 5832, 20412, 739008, 12791896, 52394312, 52394312, 12791896, 739008, 20412, 69984, 4533744]

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

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