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 A073191 #3 Oct 17 2015 08:36:23 %S A073191 1,1,2,4,11,31,96,305,1007,3389,11636,40498,142714,507870,1823040, %T A073191 6591885,23989419,87795473,322922652,1193058230,4425547638, %U A073191 16475756738,61539293424,230548633954,866095934598,3261868457698,12313423931624 %N A073191 Number of separate orbits/cycles to which the Catalan bijections A072796/A072797 partition each A000108(n) structures encoded in the range [A014137(n-1)..A014138(n-1)] of the sequence A014486/A063171. %F A073191 a(n) = (A000108(n)+A073190(n))/2. %Y A073191 Occurs for first time in A073201 as row 1. %K A073191 nonn %O A073191 0,3 %A A073191 _Antti Karttunen_, Jun 25 2002