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 A166494 #5 Mar 30 2012 18:52:04 %S A166494 3,8,5,5,12,12,7,7,7,16,16,16,9,9,9,9,20,20,20,20,11,11,11,11,11,24, %T A166494 24,24,24,24,13,13,13,13,13,13,28,28,28,28,28,28,15,15,15,15,15,15,15, %U A166494 32,32,32,32,32,32,32,17,17,17,17,17,17,17,17,36,36,36,36,36,36,36,36,19,19,19,19,19,19,19,19,19,40,40,40,40,40,40,40,40,40,21,21,21,21,21,21,21,21 %N A166494 Irregular triangle T(n,k) = greatest common divisor of n-th row terms of A143753. %F A166494 T(n,k) = A022998(n+2). %e A166494 3; %e A166494 8; %e A166494 5,5; %e A166494 12,12; %e A166494 7,7,7; %e A166494 16,16,16; %Y A166494 Cf. A166866. %K A166494 nonn,tabf,easy %O A166494 1,1 %A A166494 _Paul Curtz_, Oct 15 2009