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 A157283 #14 Aug 26 2017 18:02:00 %S A157283 1,1,1,1,2,1,1,3,-3,1,1,4,6,0,1,1,5,-10,-10,-5,1,1,6,15,-20,15,-6,1,1, %T A157283 7,-21,0,0,-21,-7,1,1,8,28,56,0,0,0,0,1,1,9,-36,84,126,126,0,0,0,1,1, %U A157283 10,45,0,-210,252,-210,0,0,-10,1,1,11,-55,-165,330,0,0,330,165,-55,-11,1,1 %N A157283 k X k determinants at the n-th row of A126988. %C A157283 The n-th value in the k-th column in this triangle is a k X k determinant of A126988 beginning at the n-th row and the first column of A126988. The absolute values of the nonzero values appear to be as in Pascal's triangle A007318. The second diagonal appears to be zero at nonsquare free column indices. There are a lot of zeros in the middle as the table gets bigger. %e A157283 Table begins: %e A157283 1 %e A157283 1 1 %e A157283 1 2 1 %e A157283 1 3 -3 1 %e A157283 1 4 6 0 1 %e A157283 1 5 -10 -10 -5 1 %e A157283 1 6 15 -20 15 -6 1 %e A157283 1 7 -21 0 0 -21 -7 1 %e A157283 1 8 28 56 0 0 0 0 1 %e A157283 1 9 -36 84 126 126 0 0 0 1 %e A157283 1 10 45 0 -210 252 -210 0 0 -10 1 %Y A157283 Cf. A007318, A126988. %K A157283 sign,tabl %O A157283 1,5 %A A157283 _Mats Granvik_ and _Gary W. Adamson_, Feb 26 2009