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 A260017 #7 Jul 14 2015 03:14:40 %S A260017 6,30,12,138,48,24,618,180,84,60,2730,792,264,192,180,11946,3444,1128, %T A260017 528,552,588 %N A260017 Triangle read by rows giving certain self-avoiding walk data for the triangular lattice. %C A260017 See Redner (1980) for precise definition. %H A260017 S. Redner, <a href="http://physics.bu.edu/~redner/pubs/pdf/jpa13p3525.pdf">Distribution functions in the interior of polymer chains</a>, J. Phys. A 13 (1980), 3525-3541, doi:10.1088/0305-4470/13/11/023. %e A260017 Triangle begins: %e A260017 6, %e A260017 30,12, %e A260017 138,48,24, %e A260017 618,180,84,60, %e A260017 2730,792,264,192,180, %e A260017 11946,3444,1128,528,552,588, %e A260017 ... %Y A260017 Diagonals include A001334, A007200, A007201. %K A260017 nonn,tabl,more %O A260017 1,1 %A A260017 _N. J. A. Sloane_, Jul 13 2015