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 A270578 #9 Aug 27 2024 14:57:40 %S A270578 20,491,7502,52013,297464,1119791,3900890,11135201,29329232 %N A270578 The number of distinct planes defined by an n X n X n grid of points. %e A270578 The 8 points of the 2 X 2 X 2 grid define 20 planes: the 6 faces of the cube, 6 planes formed by an edge and its opposite edge, and 8 planes defined by the three vertices surrounding a given vertex. So, a(2)=20. %Y A270578 Cf. A222267, A270579. %K A270578 nonn,more %O A270578 2,1 %A A270578 _Clive Tooth_, Mar 19 2016