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.

A197471 Number of nX4 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 1
2 12
3 46
4 184
5 748
6 2824
7 10934
8 42474
9 164782
10 638460
11 2473902
12 9589038
13 37167908
14 144059050
15 558354234
16 2164121964
17 8387927204
18 32510787510
19 126008566828
20 488396574430
21 1892976376006
22 7336987712088
23 28437432700816
24 110220652223106

List of values

[1, 12, 46, 184, 748, 2824, 10934, 42474, 164782, 638460, 2473902, 9589038, 37167908, 144059050, 558354234, 2164121964, 8387927204, 32510787510, 126008566828, 488396574430, 1892976376006, 7336987712088, 28437432700816, 110220652223106]

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

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