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 A081154 #7 Jan 11 2024 09:09:06 %S A081154 0,0,2,6,18,50,142,388,1114 %N A081154 Number of odd cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with no fixed points of either A057163 or A057164. %F A081154 a(n) = A081153(2n+1). %Y A081154 Cf. A081153, A014137, A014138, A057505, A057506, A057163, A057164. %K A081154 nonn,more %O A081154 0,3 %A A081154 _Wouter Meeussen_ and _Antti Karttunen_, Mar 10 2003