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 A127442 #12 Mar 13 2023 07:19:47 %S A127442 1,1,-2,1,-2,0,1,-2,0,1,1,-2,0,1,-1,1,-2,0,1,-1,2,1,-2,0,1,-1,2,-2,1, %T A127442 -2,0,1,-1,2,-2,1,1,-2,0,1,-1,2,-2,1,0,1,-2,0,1,-1,2,-2,1,0,1,1,-2,0, %U A127442 1,-1,2,-2,1,0,1,-2,1 %N A127442 Triangle read by rows: row n consists of 1 followed by initial n-1 terms of A127440. %C A127442 Row sums give A008683. %e A127442 Triangle begins: %e A127442 1 %e A127442 1 -2, %e A127442 1 -2, 0, %e A127442 1 -2, 0, 1, %e A127442 1 -2, 0, 1, -1, %e A127442 1 -2, 0, 1, -1, 2, %e A127442 1 -2, 0, 1, -1, 2, -2, %e A127442 1 -2, 0, 1, -1, 2, -2, 1, %e A127442 1 -2, 0, 1, -1, 2, -2, 1, 0, %e A127442 1 -2, 0, 1, -1, 2, -2, 1, 0, 1, %e A127442 1 -2, 0, 1, -1, 2, -2, 1, 0, 1, -2, %Y A127442 Cf. A127440 (first differences of mu(n), A008683). %Y A127442 Cf. A008683. %K A127442 tabl,sign %O A127442 1,3 %A A127442 _Gary W. Adamson_, Jan 14 2007 %E A127442 One term corrected by _T. D. Noe_, Feb 08 2007 %E A127442 Edited, corrected and extended by _N. J. A. Sloane_, Mar 01 2007