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 A127325 #10 Dec 21 2022 08:19:59 %S A127325 0,0,0,1,0,0,0,1,0,0,1,0,2,1,0,0,0,1,0,0,1,0,2,1,0,0,1,0,2,1,0,3,2,1, %T A127325 0,0,0,1,0,0,1,0,2,1,0,0,1,0,2,1,0,3,2,1,0,0,1,0,2,1,0,3,2,1,0,4,3,2, %U A127325 1,0,0,0,1,0,0,1,0,2,1,0,0,1,0,2,1,0,3,2,1,0,0,1,0,2,1,0,3,2,1,0,4,3,2,1,0 %N A127325 Hypertetrahedron with T(W,X,Y,Z) = Y - Z. %C A127325 Together with A127324, A127326 and A127327 might enable reading "by antidiagonals" of hypercube arrays as 4-dimensional analog of A056558, A056560 and A056559 with cubical arrays. %F A127325 a(n) = A127323(n) - A127324(n). %e A127325 a(23)=1 because A127323(23) - A127324(23) = 1. %e A127325 See A127327 for a table of A127324, A127325, A127326, A127327. %Y A127325 Cf. A127321, A127322, A127323, A127324, A127326, A127327. %Y A127325 Cf. A056558, A056560, A056559. %K A127325 nonn %O A127325 0,13 %A A127325 _Graeme McRae_, Jan 10 2007