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 A364206 #16 Jul 24 2023 15:09:34 %S A364206 1,24,360144,20914499571840 %N A364206 a(n) is the number of n X n nonsingular matrices using all the integers from 1 to n^2. %F A364206 a(n) = (n^2)! - A221976(n). - _Vaclav Kotesovec_, Jul 16 2023 %Y A364206 Right diagonal of A364203. %Y A364206 Cf. A085000 (maximal determinant), A350565 (minimal permanent), A350566 (maximal permanent). %Y A364206 Cf. A364227 (with prime numbers). %Y A364206 Cf. A088020, A136609, A221976. %K A364206 nonn,hard,more %O A364206 1,2 %A A364206 _Stefano Spezia_, Jul 13 2023 %E A364206 a(4) from _Vaclav Kotesovec_, Jul 16 2023 (using A221976)