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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.

A089674 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 read in the upward direction and the main antidiagonal, are all distinct.

Table of values

n a(n)
1 0
2 0
3 0
4 1692
5 2329280
6 13441654352
7 190945826194432

List of values

[0, 0, 0, 1692, 2329280, 13441654352, 190945826194432]

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

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