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 A039740 #4 Mar 19 2018 06:34:05 %S A039740 1,4,12,44,182,796,3612,16786,79426,381250,1851832,9086022,44970688, %T A039740 224279188,1126038472,5687027204,28873452032,147281732692,754443210294 %N A039740 Lattice animals in the cubic diamond lattice (4 nearest neighbors), even-vertex-connected cubes. %K A039740 nonn %O A039740 1,2 %A A039740 _Achim Flammenkamp_