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 A081160 #8 Jan 11 2024 09:18:17 %S A081160 0,0,1,1,3,4,10,16,35,60,126,225,462,848,1716,3188,6435,12095,24310 %N A081160 Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506, with two fixed-points of A057164. %Y A081160 Bisections: A001700 (shifted right and prepended with zero) and A081161. %Y A081160 Cf. A081150, A081157, A081162. %Y A081160 Cf. A014137, A014138, A057505, A057506, A057164. %K A081160 nonn,more %O A081160 0,5 %A A081160 _Wouter Meeussen_ and _Antti Karttunen_, Mar 10 2003