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 A082861 #6 Jan 12 2024 07:48:06 %S A082861 0,1,1,2,2,2,3,3,6,3,4,4,4,14,4,5,5,5,15,11,5,6,6,6,6,14,15,6,7,7,16, %T A082861 7,42,43,16,7,8,8,19,8,51,52,19,20,8,9,9,9,37,9,28,37,121,149,9,10,10, %U A082861 10,38,10,29,38,122,150,25,10,11,11,11,39,11,11,39,123,151,28,29,11,12,12,12,40,30,12,40,124,152,84,85,30,12,13,13,13,41,33,13,41,125,153 %N A082861 Lower triangular region of A082860. %H A082861 Antti Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/ACO1.htm">Alternative Catalan Orderings</a> (with the complete Scheme source) %o A082861 (Scheme-functions showing the essential idea. For the full source, follow the "Alternative Catalan Orderings" link.) %o A082861 (define (A082861 n) (A080300 (parenthesization->binexp (LCSB (binexp->parenthesization (A014486 (A003056 n))) (binexp->parenthesization (A014486 (A002262 n))))))) %Y A082861 Cf. A082859, A003056, A002262. %K A082861 nonn,tabl %O A082861 0,4 %A A082861 _Antti Karttunen_, May 06 2003