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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.

A215790 Number of permutations of 0..floor((4*n-1)/2) on even squares of an 4*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 2
5 10
6 29
7 262
8 932
9 11694
10 46988
11 727846
12 3166688
13 56797272
14 261286670
15 5219906670
16 25024705056

List of values

[1, 1, 1, 2, 10, 29, 262, 932, 11694, 46988, 727846, 3166688, 56797272, 261286670, 5219906670, 25024705056]

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

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