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 A128208 #6 Mar 31 2024 15:36:54 %S A128208 1,1,1,0,1,1,0,0,3,1,0,0,0,5,1,0,0,0,0,11,1,0,0,0,0,0,21,1,0,0,0,0,0, %T A128208 0,43,1,0,0,0,0,0,0,0,85,1,0,0,0,0,0,0,0,0,171,1,0,0,0,0,0,0,0,0,0, %U A128208 341,1 %N A128208 Inverse of number triangle A128210. %C A128208 Subdiagonal is A001045(n+1). Row sums are A128209. %e A128208 Triangle begins: %e A128208 1; %e A128208 1, 1; %e A128208 0, 1, 1; %e A128208 0, 0, 3, 1; %e A128208 0, 0, 0, 5, 1; %e A128208 0, 0, 0, 0, 11, 1; %e A128208 0, 0, 0, 0, 0, 21, 1; %e A128208 0, 0, 0, 0, 0, 0, 43, 1; %e A128208 0, 0, 0, 0, 0, 0, 0, 85, 1; %e A128208 0, 0, 0, 0, 0, 0, 0, 0, 171, 1; %e A128208 0, 0, 0, 0, 0, 0, 0, 0, 0, 341, 1; %e A128208 ... %K A128208 nonn,tabl %O A128208 0,9 %A A128208 _Paul Barry_, Feb 19 2007