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 A129882 #5 Mar 30 2013 04:51:42
%S A129882 0,2,4,4,12,18,56,72
%N A129882 Sequence i_{t_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n = A129876, t_n = A129875.
%D A129882 Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.
%F A129882 See Quaintance reference for generating functions that produce A129872-A129886.
%K A129882 nonn,more
%O A129882 1,2
%A A129882 _N. J. A. Sloane_, May 26 2007