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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.

A196209 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 17
2 43
3 42
4 305
5 751
6 2922
7 10986
8 35529
9 128823
10 472599
11 1687338
12 6179264
13 22255717
14 79844666
15 288974977
16 1050069655
17 3810469340
18 13776469497
19 49876710085
20 180636295947
21 654371189198
22 2372238997568
23 8596886259187

List of values

[17, 43, 42, 305, 751, 2922, 10986, 35529, 128823, 472599, 1687338, 6179264, 22255717, 79844666, 288974977, 1050069655, 3810469340, 13776469497, 49876710085, 180636295947, 654371189198, 2372238997568, 8596886259187]

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

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