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 A139331 #3 Apr 05 2012 18:25:45 %S A139331 1,1,1,1,1,1,1,2,2,1,1,6,12,6,1,1,12,72,72,12,1,1,20,240,720,240,20,1, %T A139331 1,30,600,3600,3600,600,30,1,1,56,1680,16800,33600,16800,1680,56,1,1, %U A139331 72,4032,60480,201600,201600,60480,4032,72,1 %N A139331 Triangle read by rows: ConvOffsStoT transform of A103505. %e A139331 First few rows of the triangle are: %e A139331 1; %e A139331 1, 1; %e A139331 1, 1, 1; %e A139331 1, 2, 2, 1; %e A139331 1, 6, 12, 6, 1; %e A139331 1, 12, 72, 72, 12, 1; %e A139331 1, 20, 240, 720, 240, 20, 1; %e A139331 1, 30, 600, 3600, 3600, 600, 30, 1; %e A139331 ... %e A139331 Row 4 = (1, 6, 12, 6, 1) since ConvOffs transform of (1, 1, 2, 6) = (1, 6, 12, 6, 1); where A103505 = (1, 1, 2, 6, 12, 20, 30, 56, 72,...). %Y A139331 Cf. A103505. %K A139331 nonn,tabl %O A139331 0,8 %A A139331 _Gary W. Adamson_ and _Roger L. Bagula_, Apr 13 2008