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 A143316 #6 Aug 14 2023 06:53:35 %S A143316 1,2,1,4,0,1,4,2,0,1,8,0,0,0,1,4,4,2,0,0,1,12,0,0,0,0,0,1,8,4,0,2,0,0, %T A143316 0,1,12,0,4,0,0,0,0,0,1,8,8,0,0,2,0,0,0,0,1,20,0,0,0,0,0,0,0,0,0,1,8, %U A143316 4,4,4,0,2,0,0,0,0,0,1,24,0,0,0,0,0,0,0,0,0,0,0,1,12,12,0,0,0,0,2,0,0,0,0,0,0,1 %N A143316 Triangle read by rows, A054525 * A143315, 1<=k<=n. %C A143316 Row sums = 2*n-1. %C A143316 Left border = A140434: (1, 2, 4, 4, 8, 4, 12, 8,...). %e A143316 First few rows of the triangle = %e A143316 1; %e A143316 2, 1; %e A143316 4, 0, 1; %e A143316 4, 2, 0, 1; %e A143316 8, 0, 0, 0, 1; %e A143316 4, 4, 2, 0, 0, 1; %e A143316 12, 0, 0, 0, 0, 0, 1; %e A143316 8, 4, 0, 2, 0, 0, 0, 1; %e A143316 ... %Y A143316 Cf. A054525, A140434, A143315. %K A143316 nonn,tabl %O A143316 1,2 %A A143316 _Gary W. Adamson_, Aug 06 2008 %E A143316 a(19) corrected and more terms from _Georg Fischer_, Aug 14 2023