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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.

A197447 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 7
2 107
3 2678
4 52117
5 1108699
6 23829080
7 504568165
8 10724642167
9 228248265080
10 4853181015432
11 103200753393047
12 2194748772730124
13 46673287485335449
14 992547357156970890
15 21107504726738892508
16 448871249985110511395

List of values

[7, 107, 2678, 52117, 1108699, 23829080, 504568165, 10724642167, 228248265080, 4853181015432, 103200753393047, 2194748772730124, 46673287485335449, 992547357156970890, 21107504726738892508, 448871249985110511395]

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

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