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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.

A194617 Half the number of lower triangles of a 4 X 4 0..n array with no element equal to the average of its horizontal and vertical neighbors.

Table of values

n a(n)
1 47
2 4322
3 132214
4 1674043
5 12561823
6 66369488
7 279618492
8 975189851
9 2972844263
10 8086809479
11 20111108169
12 46277171169
13 100029289052
14 204344500677
15 398372414831
16 744412292078
17 1341415693780
18 2338177034539
19 3960008651919

List of values

[47, 4322, 132214, 1674043, 12561823, 66369488, 279618492, 975189851, 2972844263, 8086809479, 20111108169, 46277171169, 100029289052, 204344500677, 398372414831, 744412292078, 1341415693780, 2338177034539, 3960008651919]

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

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