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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.

A089673 a(n) = number of n X n (0,1) matrices A such that the 2n+2 vectors consisting of the rows and the columns of the matrix A, as well as the main diagonal and the main antidiagonal, are all distinct.

Table of values

n a(n)
1 0
2 0
3 0
4 652
5 1658784
6 10726929248
7 172790068546048

List of values

[0, 0, 0, 652, 1658784, 10726929248, 172790068546048]

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

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