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 A298824 #23 Jun 25 2018 23:40:00 %S A298824 1,2,-2,-1,2,-1,3,-1,3,-1,2,2,-3,2,-3,-2,-4,-2,2,4,2,2,2,2,2,-5,2,-5, %T A298824 4,0,4,0,4,0,4,0,-3,3,-3,-3,3,-3,-3,3,-3,4,-4,-6,-4,-6,-4,4,6,4,6,2,2, %U A298824 2,2,2,2,2,2,-9,2,-9,-3,-2,-3,1,6,1,-3,-2,-3,1,6,1,2,2,2,2,2,2,2,2,2,2,-11,2,-11 %N A298824 Triangle read by rows. The transpose of the upper triangular part of the square matrix A298674. %F A298824 T(n,k) = A298674(k,n), n <= k. %e A298824 Triangle begins: %e A298824 ========================================================== %e A298824 n\k| 1 2 3 4 5 6 7 8 9 10 11 12 13 %e A298824 ---+------------------------------------------------------ %e A298824 1 | 1 %e A298824 2 | 2 -2 %e A298824 3 | -1 2 -1 %e A298824 4 | 3 -1 3 -1 %e A298824 5 | 2 2 -3 2 -3 %e A298824 6 | -2 -4 -2 2 4 2 %e A298824 7 | 2 2 2 2 -5 2 -5 %e A298824 8 | 4 0 4 0 4 0 4 0 %e A298824 9 | -3 3 -3 -3 3 -3 -3 3 -3 %e A298824 10 | 4 -4 -6 -4 -6 -4 4 6 4 6 %e A298824 11 | 2 2 2 2 2 2 2 2 -9 2 -9 %e A298824 12 | -3 -2 -3 1 6 1 -3 -2 -3 1 6 1 %e A298824 13 | 2 2 2 2 2 2 2 2 2 2 -11 2 -11 %t A298824 Transpose[UpperTriangularize[A298674]] %Y A298824 Row sums are A298825. %Y A298824 Cf. A298674. %K A298824 sign,tabl %O A298824 1,2 %A A298824 _Mats Granvik_, Jan 27 2018