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 A127327 #10 Dec 21 2022 08:19:47 %S A127327 0,1,0,0,0,2,1,1,1,0,0,0,0,0,0,3,2,2,2,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0, %T A127327 0,4,3,3,3,2,2,2,2,2,2,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A127327 0,0,5,4,4,4,3,3,3,3,3,3,2,2,2,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 %N A127327 Hypertetrahedron with T(W,X,Y,Z) = W - X. %C A127327 Together with A127324, A127325 and A127326 might enable reading "by antidiagonals" of hypercube arrays as 4-dimensional analog of A056558, A056560 and A056559 with cubical arrays. %F A127327 a(n) = A127321(n) - A127322(n). %e A127327 a(23)=1 because A127321(23) - A127322(23) = 1. %e A127327 Table of A127324, A127325, A127326, A127327: %e A127327 n w,x,y,z %e A127327 0 0,0,0,0 %e A127327 1 0,0,0,1 %e A127327 2 0,0,1,0 %e A127327 3 0,1,0,0 %e A127327 4 1,0,0,0 %e A127327 5 0,0,0,2 %e A127327 6 0,0,1,1 %e A127327 7 0,1,0,1 %e A127327 8 1,0,0,1 %e A127327 9 0,0,2,0 %e A127327 10 0,1,1,0 %e A127327 11 1,0,1,0 %e A127327 12 0,2,0,0 %e A127327 13 1,1,0,0 %e A127327 14 2,0,0,0 %e A127327 15 0,0,0,3 %e A127327 16 0,0,1,2 %e A127327 17 0,1,0,2 %e A127327 18 1,0,0,2 %e A127327 19 0,0,2,1 %e A127327 20 0,1,1,1 %e A127327 21 1,0,1,1 %e A127327 22 0,2,0,1 %e A127327 23 1,1,0,1 %Y A127327 Cf. A127321, A127322, A127323, A127324, A127325, A127326. %Y A127327 Cf. A056558, A056560, A056559. %K A127327 nonn %O A127327 0,6 %A A127327 _Graeme McRae_, Jan 10 2007