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.

A197472 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 24
3 181
4 748
5 5408
6 22672
7 151748
8 684002
9 4368923
10 20344854
11 126020110
12 603916958
13 3643523708
14 17866994674
15 105586791488
16 527450827498
17 3064686007756
18 15542757419162
19 89084044386061
20 457335065118848

List of values

[4, 24, 181, 748, 5408, 22672, 151748, 684002, 4368923, 20344854, 126020110, 603916958, 3643523708, 17866994674, 105586791488, 527450827498, 3064686007756, 15542757419162, 89084044386061, 457335065118848]

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

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