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 A342598 #18 Feb 10 2022 15:26:11 %S A342598 1,8,216,19584,5542200,4551802560,10225942680240,60077099766620160 %N A342598 Number of n X n 01-matrices with zero permanent from which it is possible to obtain a 01-matrix with permanent 1 by increasing a single element by 1. %C A342598 a(n) <= n * A089482(n). %Y A342598 Cf. A089482, A003024, A342599. %K A342598 nonn,more,hard %O A342598 1,2 %A A342598 _Max Alekseyev_, Mar 16 2021 %E A342598 a(8) from _Max Alekseyev_, Feb 10 2022