cp's OEIS Frontend

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.

A215873 Number of permutations of 0..floor((5*n-2)/2) on odd squares of an 5Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.

Table of values

n a(n)
1 1
2 1
3 1
4 4
5 20
6 189
7 1642
8 26451
9 307874
10 7027942
11 98057806
12 2850280812
13 44974137856

List of values

[1, 1, 1, 4, 20, 189, 1642, 26451, 307874, 7027942, 98057806, 2850280812, 44974137856]

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

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