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 A128206 #2 Mar 30 2012 18:59:20 %S A128206 1,1,1,0,1,1,0,0,2,1,0,0,0,3,1,0,0,0,0,5,1,0,0,0,0,0,8,1,0,0,0,0,0,0, %T A128206 13,1,0,0,0,0,0,0,0,21,1,0,0,0,0,0,0,0,0,34,1,0,0,0,0,0,0,0,0,0,55,1 %N A128206 Inverse of number triangle A128207. %C A128206 Row sums are A001611. Subdiagonal is A000045(n+1). %e A128206 Triangle begins %e A128206 1, %e A128206 1, 1, %e A128206 0, 1, 1, %e A128206 0, 0, 2, 1, %e A128206 0, 0, 0, 3, 1, %e A128206 0, 0, 0, 0, 5, 1, %e A128206 0, 0, 0, 0, 0, 8, 1, %e A128206 0, 0, 0, 0, 0, 0, 13, 1, %e A128206 0, 0, 0, 0, 0, 0, 0, 21, 1, %e A128206 0, 0, 0, 0, 0, 0, 0, 0, 34, 1, %e A128206 0, 0, 0, 0, 0, 0, 0, 0, 0, 55, 1 %K A128206 nonn,tabl %O A128206 0,9 %A A128206 _Paul Barry_, Feb 19 2007