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 A270805 #7 Apr 02 2016 18:41:20 %S A270805 0,0,1,5,16,31,53,86,127,167,214,265 %N A270805 Number of regular tetrahedra in an n-node-per-edge tetrahedral grid that have all four vertices on the boundary of the parent grid. %Y A270805 Cf. A269747, A270806. %K A270805 nonn,more %O A270805 0,4 %A A270805 _N. J. A. Sloane_, Apr 02 2016