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 A124279 #2 Mar 30 2012 18:59:18
%S A124279 1,1,1,1,1,1,1,2,1,1,1,3,3,1,1,1,4,5,4,1,1,1,5,8,7,5,1,1,1,6,12,13,9,
%T A124279 6,1,1,1,7,17,22,19,11,7,1,1,1,8,23,35,35,26,13,8,1,1,1,9,30,53
%N A124279 Riordan array (1/(1-x),x(1-x+x^2)/(1-x)).
%C A124279 Row sums are A005314. Diagonal sums are A124280. T(2n,n) is A002426.
%C A124279 Reversal of A124445. - _Paul Barry_, Nov 01 2006
%F A124279 Number triangle T(n,k)=sum{j=0..n-k, C(j,n-k-j)C(k,n-k-j)}
%e A124279 Triangle begins
%e A124279 1,
%e A124279 1, 1,
%e A124279 1, 1, 1,
%e A124279 1, 2, 1, 1,
%e A124279 1, 3, 3, 1, 1,
%e A124279 1, 4, 5, 4, 1, 1,
%e A124279 1, 5, 8, 7, 5, 1, 1
%K A124279 easy,nonn,tabl
%O A124279 0,8
%A A124279 _Paul Barry_, Oct 24 2006