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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.

A196333 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,3,1,2 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 17
3 50
4 335
5 894
6 3246
7 14973
8 64423
9 270901
10 1067992
11 4278465
12 17554846
13 73250696
14 303360883
15 1240601669
16 5071382869
17 20820082942
18 85773230271
19 353226448334
20 1451624154342
21 5960878160915
22 24492093845487
23 100710579314169

List of values

[5, 17, 50, 335, 894, 3246, 14973, 64423, 270901, 1067992, 4278465, 17554846, 73250696, 303360883, 1240601669, 5071382869, 20820082942, 85773230271, 353226448334, 1451624154342, 5960878160915, 24492093845487, 100710579314169]

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

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