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 A324638 #8 Jun 01 2025 19:57:18 %S A324638 1,1,1,18,215,5320,173111,8041166,483906047,37296199680,3556982106479, %T A324638 412503302058958 %N A324638 Number of permutations p of [2n] such that n is the maximum of 0 and the number of elements in any integer interval [p(i)..i+2n*[i<p(i)]]. %Y A324638 Cf. A324563, A324564. %K A324638 nonn,more %O A324638 0,4 %A A324638 _Alois P. Heinz_, Mar 09 2019