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.
%I A364777 #24 Aug 08 2023 04:33:21 %S A364777 1,16,108864,2391175987200,615524208068689920000000, %T A364777 4831082166102613213870122703257600000000, %U A364777 2481336275198061145749280386508780674949224836628480000000000 %N A364777 a(n) = (n^2)!*(n!)^2/(2*n-1)!. %C A364777 a(n) is the number of square matrices of size n, whose elements are a permutation of 1, 2, ..., n^2, having a saddle point. %H A364777 A. J. Goldman, <a href="https://www.jstor.org/stable/2309755">The probability of a saddlepoint</a>, The American Mathematical Monthly, 64, 10 (1957), pp. 729-730. %H A364777 E. D. Thorp, <a href="http://www.edwardothorp.com/wp-content/uploads/2016/11/TheProbabilityThatAMatrixHasASaddlePoint.pdf">The probability that a matrix has a saddle point</a>, Information Sciences 19 2 (1979), 91-95. %K A364777 nonn %O A364777 1,2 %A A364777 _Sela Fried_, Aug 07 2023