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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.

A197404 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 20
3 60
4 358
5 1626
6 7232
7 34717
8 160988
9 748843
10 3514426
11 16448990
12 76889286
13 359867470
14 1684122959
15 7879951514
16 36879246800
17 172597946528
18 807735845097
19 3780221117751
20 17691605965676
21 82797291928191
22 387496301051514

List of values

[4, 20, 60, 358, 1626, 7232, 34717, 160988, 748843, 3514426, 16448990, 76889286, 359867470, 1684122959, 7879951514, 36879246800, 172597946528, 807735845097, 3780221117751, 17691605965676, 82797291928191, 387496301051514]

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

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