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 A143445 #2 Mar 30 2012 17:25:32 %S A143445 1,1,2,1,0,5,1,2,0,7,1,0,0,0,12,1,2,5,0,0,15,1,0,0,0,0,0,22,1,2,0,7,0, %T A143445 0,0,26,1,0,5,0,0,0,0,0,35,1,2,0,0,12,0,0,0,0,40,1,0,0,0,0,0,0,0,0,0, %U A143445 51,1,2,5,7,0,15,0,0,0,0,0,57 %N A143445 Triangle read by rows, A051731 * (A001318 * 0^(n-k)); 1<=k<=n. %C A143445 Row sums = A079248: (1, 3, 6, 10, 13, 23,...) %F A143445 Triangle read by rows, A051731 * (A001318 * 0^(n-k)); 1<=k<=n. A051731 = the inverse Mobius transform and (A001318 * 0^(n-k)) = an infinite lower triangular matrix with A001318 (1, 2, 5, 7, 12, 15, 22,...) in the main diagonal and the rest zeros. %e A143445 First few rows of the triangle = %e A143445 1; %e A143445 1, 2; %e A143445 1, 0, 5; %e A143445 1, 2, 0, 7; %e A143445 1, 0, 0, 0, 12; %e A143445 1, 2, 5, 0, 0, 15; %e A143445 ... %Y A143445 Cf. A051731, A001318, A079248. %K A143445 nonn,tabl %O A143445 1,3 %A A143445 _Gary W. Adamson_, Aug 15 2008