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 A115363 #2 Mar 30 2012 18:59:13 %S A115363 1,2,1,0,0,1,3,2,0,1,0,0,0,0,1,0,0,2,0,0,1,0,0,0,0,0,0,1,4,3,0,2,0,0, %T A115363 0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,2,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0, %U A115363 3,0,0,2,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2,0,0,0,0,0,0,1 %N A115363 ((1,x)-(x,x^2))^(-2) (using Riordan array notation). %C A115363 Square of number triangle A115361. Row sums are A115364. %e A115363 Triangle begins %e A115363 1, %e A115363 2, 1, %e A115363 0, 0, 1, %e A115363 3, 2, 0, 1, %e A115363 0, 0, 0, 0, 1, %e A115363 0, 0, 2, 0, 0, 1, %e A115363 0, 0, 0, 0, 0, 0, 1, %e A115363 4, 3, 0, 2, 0, 0, 0, 1, %e A115363 0, 0, 0, 0, 0, 0, 0, 0, 1, %e A115363 0, 0, 0, 0, 2, 0, 0, 0, 0, 1, %e A115363 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, %e A115363 0, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 1, %K A115363 nonn,tabl %O A115363 0,2 %A A115363 _Paul Barry_, Jan 21 2006