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 A162883 #7 Aug 26 2017 18:32:42 %S A162883 1,-2,1,-3,3,1,0,6,-4,1,-5,-10,-10,5,1,6,15,20,15,-6,1,-7,-21,0,0,-21, %T A162883 7,1,0,0,0,0,-56,28,-8,1,0,0,0,126,126,84,-36,9,1,10,0,0,-210,-252, %U A162883 -210,0,45,-10,1,-11,-55,165,330,0,0,330,-165,-55,11,1,0,-66,0,-495,-792,0,0 %N A162883 Triangle T(n,k) read by rows: k X k determinants ending at the n-th row of A127139. %C A162883 Absolute values of nonzero elements appear to be as in Pascal's triangle. The table consists mostly of zeros. %e A162883 Table begins: %e A162883 1; %e A162883 -2, 1; %e A162883 -3, 3, 1; %e A162883 0, 6, -4, 1; %e A162883 -5, -10, -10, 5, 1; %e A162883 6, 15, 20, 15, -6, 1; %e A162883 -7, -21, 0, 0, -21, 7, 1; %e A162883 0, 0, 0, 0, -56, 28, -8, 1; %e A162883 0, 0, 0, 126, 126, 84, -36, 9, 1; %e A162883 10, 0, 0, -210, -252, -210, 0, 45, -10, 1; %Y A162883 Cf. A127139, A157379. %K A162883 sign,tabl %O A162883 1,2 %A A162883 _Mats Granvik_, Jul 16 2009