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 A122479 #5 Sep 08 2013 13:30:55 %S A122479 1,1,2,3,6,8,9,26,40,48,35,110,224,312,360,145,514,1160,2056,2728, %T A122479 3088,659,2478,5208,12152,20024,25840,28928,3137,12482,33320,71704, %U A122479 129720,204512,259280,288208,15619,64558,182064,416808,822744,1416256,2168256 %N A122479 Triangle T(n,k), 0<=k<=n, defined by T(n,k) = 0 if k<0 or k>n, T(0,0) = 1, T(n,k) = T(n,k-1)+T(n-1,k-1)+T(n-1,k)+T(n-1,k+1). %e A122479 Triangle begins: %e A122479 1; %e A122479 1, 2; %e A122479 3, 6, 8; %e A122479 9, 26, 40, 48; %e A122479 35, 110, 224, 312, 360; %e A122479 145, 514, 1160, 2056, 2728, 3088; %K A122479 nonn,tabl %O A122479 0,3 %A A122479 _Philippe Deléham_, Sep 15 2006