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 A081152 #6 Jan 11 2024 09:03:43 %S A081152 0,1,6,37,212,1226,6822,38081,215414 %N A081152 Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506. %F A081152 a(n) = A081150(2n+1) = A081159(n)+A081161(n)+A081163(n). %Y A081152 Cf. A081151. %Y A081152 Cf. A081150, A081159, A081161, A081163. %Y A081152 Cf. A014137, A014138, A057505, A057506. %K A081152 nonn,more %O A081152 0,3 %A A081152 _Wouter Meeussen_ and _Antti Karttunen_, Mar 10 2003