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 A081149 #7 Jan 11 2024 09:19:17 %S A081149 1,1,4,9,24,62,162,447,1234 %N A081149 Number of odd cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506. %F A081149 a(n) = A081148(2n+1). %Y A081149 Cf. A014137, A014138, A057505, A057506, A081148. %K A081149 nonn,more %O A081149 0,3 %A A081149 _Wouter Meeussen_ and _Antti Karttunen_, Mar 10 2003