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 A172985 #2 Mar 30 2012 17:34:38 %S A172985 1,1,1,1,1,1,1,1,1,1,1,4,4,4,1,1,1,4,4,1,1,1,6,6,24,6,6,1,1,1,6,6,6,6, %T A172985 1,1,1,8,8,48,12,48,8,8,1,1,9,72,72,108,108,72,72,9,1,1,10,90,720,180, %U A172985 1080,180,720,90,10,1,1,1,10,90,180,180,180,180,90,10,1,1,1,12,12,120,270 %N A172985 Triangle T(n,m) = A049614(n)/ (A049614(m)*A049614(n-m)) read by rows. %C A172985 Row sums are: 1, 2, 3, 4, 14, 12, 50, 28, 142, 524, 3082,... %e A172985 1; %e A172985 1, 1; %e A172985 1, 1, 1; %e A172985 1, 1, 1, 1; %e A172985 1, 4, 4, 4, 1; %e A172985 1, 1, 4, 4, 1, 1; %e A172985 1, 6, 6, 24, 6, 6, 1; %e A172985 1, 1, 6, 6, 6, 6, 1, 1; %e A172985 1, 8, 8, 48, 12, 48, 8, 8, 1; %e A172985 1, 9, 72, 72, 108, 108, 72, 72, 9, 1; %e A172985 1, 10, 90, 720, 180, 1080, 180, 720, 90, 10, 1; %t A172985 c[n_] := Product[If[i == 0, 1, If[PrimeQ[i], 1, i]], {i, 0, n}]; %t A172985 t[n_, m_] := c[n]/(c[m]*c[n - m]); %t A172985 Table[Table[t[n, m], {m, 0, n}], {n, 0, 10}]; %t A172985 Flatten[%] %K A172985 nonn,tabl,easy %O A172985 0,12 %A A172985 _Roger L. Bagula_, Feb 06 2010 %E A172985 Definition simplified by the Assoc. Editors of the OEIS, Mar 05 2010