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 A103428 #7 Jan 23 2021 11:16:24 %S A103428 0,62,1270,11266,63322,266748,915720,2701073,7077080,16876415, %T A103428 37242500,77038188,150862354,281877711,505585682,874900010,1466826558, %U A103428 2390947859,3799984292,5903574820,8984255594,13418520513,19700297034,28470461533 %N A103428 (1/12)*Number of non-degenerate obtuse triangles that can be formed from the points of an (n+1)X(n+1)X(n+1) lattice cube. %Y A103428 Cf. all triangles in lattice cube A103426; special triangles in lattice cube: A103427, A103429, A103499, A103500, A103501; A103158 tetrahedra in lattice cube. %Y A103428 Cf. A190020 (analogous 2-dimensional problem). %K A103428 nonn %O A103428 1,2 %A A103428 _Hugo Pfoertner_, Feb 08 2005