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.

A039917 Number of orderings of 1,2,...,n^2 in an n X n matrix such that each row, each column and both diagonals are increasing.

Table of values

n a(n)
1 1
2 1
3 9
4 2017
5 21569213
6 17835527619513
7 1677123511579177202174
8 24742950249259362969953039657613
9 75512002909758683196631913316950684079768626
10 60752021865167494642984305761115275381534124800396484901989
11 15991585283632910454908797943467512732011897255095362833558749286619895509557

List of values

[1, 1, 9, 2017, 21569213, 17835527619513, 1677123511579177202174, 24742950249259362969953039657613, 75512002909758683196631913316950684079768626, 60752021865167494642984305761115275381534124800396484901989, 15991585283632910454908797943467512732011897255095362833558749286619895509557]

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

Content is available under The OEIS End-User License Agreement.