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.

A209019 T(n,k)=Number of nXk 0..3 arrays with no element equal the average of immediate neighbors vertically above, diagonally above and left, and horizontally left of it.

Table of values

n a(n)
1 4
2 12
3 12
4 36
5 130
6 36
7 108
8 1430
9 1430
10 108
11 324
12 15724
13 57412
14 15724
15 324
16 972
17 172936
18 2303052
19 2303052
20 172936
21 972
22 2916
23 1901964
24 92409982
25 337083370
26 92409982
27 1901964
28 2916
29 8748
30 20918008
31 3707858104
32 49349902246
33 49349902246

List of values

[4, 12, 12, 36, 130, 36, 108, 1430, 1430, 108, 324, 15724, 57412, 15724, 324, 972, 172936, 2303052, 2303052, 172936, 972, 2916, 1901964, 92409982, 337083370, 92409982, 1901964, 2916, 8748, 20918008, 3707858104, 49349902246, 49349902246]

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

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