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 A079224 #4 Oct 17 2015 08:36:23 %S A079224 1,1,2,3,8,18,43,104,273,702,1870,4985,13562,37038,102266,283774, %T A079224 793189,2227115,6286044,17811751,50672898,144639235,414181050, %U A079224 1189365940,3424477813,9883578364,28589660227,82870288432,240672107114 %N A079224 Number of Catalan objects fixed by three-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees). %F A079224 a(n) = A079216(n, 3) %p A079224 A079224 := n -> A079216bi(n,3); %Y A079224 The third row of A079216. The leftmost edge of the triangle A079219 and also its row sums shifted by one. Occurs in A073202 as row 43639. Cf. A057546, A079223-A079227. %K A079224 nonn %O A079224 0,3 %A A079224 _Antti Karttunen_ Jan 03 2002