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 A144417 #4 Jan 21 2014 12:30:22 %S A144417 1,1,0,1,1,0,1,3,1,0,1,6,7,0,0,1,10,25,10,0,0,1,15,65,75,10,0,0,1,21, %T A144417 140,315,175,0,0,0,1,28,266,980,1225,280,0,0,0,1,36,462,2520,5565, %U A144417 3780,280,0,0,0,1,45,750,5670,19425,26145,9100,0,0,0,0,1,55 %N A144417 Triangle in A144385 read upwards by columns. %e A144417 Triangle begins: %e A144417 1 %e A144417 1,0 %e A144417 1,1,0 %e A144417 1,3,1,0 %e A144417 1,6,7,0,0 %e A144417 1,10,25,10,0,0 %e A144417 1,15,65,75,10,0,0 %e A144417 1,21,140,315,175,0,0,0 %Y A144417 Column sums give A001680. Cf. A144385. %K A144417 nonn,tabl %O A144417 0,8 %A A144417 _David Applegate_ and _N. J. A. Sloane_, Dec 07 2008