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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.

A183720 1/12 the number of (n+1) X (n+1) 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

Table of values

n a(n)
1 0
2 2
3 124
4 14886
5 3723606
6 2740758406
7 5585215240568
8 33429749952933774
9 583208471844467888006

List of values

[0, 2, 124, 14886, 3723606, 2740758406, 5585215240568, 33429749952933774, 583208471844467888006]

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