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 A128410 #5 Feb 18 2022 22:17:12 %S A128410 1,-2,-1,-2,-1,-1,0,0,0,0,-2,-1,-1,-1,-1,4,3,2,1,1,1,-2,-1,-1,-1,-1, %T A128410 -1,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,3,2,2,2,1,1,1,1,1 %N A128410 A128408 * A000012. %C A128410 Left border = A008966: (1, -2, -2, 0, -2, 4, -2, 0, 0, 4, ...). Row sums = A063441: (1, -3, -4, 0, -6, 12, ...) A128409 = A000012 * A128408. %F A128410 A128408 * A000012 as infinite lower triangular matrices. Partial row sums of A128408 starting from the right. %e A128410 First few rows of the triangle: %e A128410 1; %e A128410 -2, -1; %e A128410 -2, -1, -1; %e A128410 0, 0, 0, 0; %e A128410 -2, -1, -1, -1, -1; %e A128410 4, 3, 2, 1, 1, 1; %e A128410 -2, -1, -1, -1, -1, -1, -1; %e A128410 ... %Y A128410 Cf. A128407, A128408, A128409, A008966, A051731, A063441. %K A128410 tabl,sign %O A128410 1,2 %A A128410 _Gary W. Adamson_, Mar 01 2007