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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.

A215791 Number of permutations of 0..floor((5*n-1)/2) on even squares of an 5*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

Table of values

n a(n)
1 1
2 1
3 1
4 4
5 25
6 189
7 2465
8 26451
9 530429
10 7027942
11 187205626
12 2850280812

List of values

[1, 1, 1, 4, 25, 189, 2465, 26451, 530429, 7027942, 187205626, 2850280812]

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

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