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 A143518 #2 Mar 30 2012 17:25:32 %S A143518 0,0,1,0,0,1,0,-1,0,0,0,0,0,0,1,0,-1,-1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0, %T A143518 0,0,0,0,0,-1,0,0,0,0,0,0,0,-1,0,0,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 %N A143518 Triangle read by rows, A054525 * (A010051 * 0^(n-k)), 1<=k<=n. %C A143518 Row sums = A143519: (0, 1, 1, -1, 1, -2, 1, 0, -1,...) %F A143518 Triangle read by rows, A054525 * A010051, 1<=k<=n. A054525 = the Mobius transform. A010051 * 0^(n-k) = an infinite lower triangular matrix with A010051, the characteristic function of the primes (0, 1, 1, 0, 1, 0, 1,...) as the main diagonal and the rest zeros. %e A143518 First few rows of the triangle = %e A143518 0; %e A143518 0, 1; %e A143518 0, 0, 1; %e A143518 0, -1, 0, 0; %e A143518 0, 0, 0, 0, 1; %e A143518 0, -1, -1, 0, 0, 0; %e A143518 0, 0, 0, 0, 0, 0, 1; %e A143518 ... %Y A143518 Cf. A010051, A054525. %K A143518 tabl,sign %O A143518 1,1 %A A143518 _Gary W. Adamson_, Aug 22 2008