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 A202818 #7 Mar 30 2012 16:52:08 %S A202818 1,1,0,2,3,3,8,6,3,0,40,48,54,57,57,256,216,168,114,57,0 %N A202818 The left-hand half-triangle of A202691. %e A202818 Triangle begins: %e A202818 1 %e A202818 1 0 %e A202818 2 3 3 %e A202818 8 6 3 0 %e A202818 40 48 54 57 57 %e A202818 256 216 168 114 57 0 %Y A202818 Cf. A202691, A202817. %K A202818 nonn,tabl,more %O A202818 1,4 %A A202818 _N. J. A. Sloane_, Dec 25 2011