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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.

A197885 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 2
2 14
3 47
4 155
5 835
6 2263
7 10827
8 38938
9 157178
10 654028
11 2607334
12 10482745
13 41930639
14 169374587
15 686689100
16 2793219587
17 11244612740
18 45359859580
19 183328706973
20 742423862981
21 3008747408411
22 12158966386525
23 49114866456717

List of values

[2, 14, 47, 155, 835, 2263, 10827, 38938, 157178, 654028, 2607334, 10482745, 41930639, 169374587, 686689100, 2793219587, 11244612740, 45359859580, 183328706973, 742423862981, 3008747408411, 12158966386525, 49114866456717]

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

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