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 A112704 #3 Oct 12 2012 14:40:24 %S A112704 1,11,211,5211,145211,4345211,136345211,4426345211,147426345211, %T A112704 5009426345211,172969426345211,6051569426345211,214063569426345211, %U A112704 7643063569426345211,275087063569426345211,9969932063569426345211 %N A112704 Partial sum of Catalan numbers A000108 multiplied by powers of 10. %F A112704 a(n)=sum(C(k)*10^k, k=0..n), n>=0, with C(n):=A000108(n). %F A112704 G.f.: c(10*x)/(1-x), where c(x):=(1-sqrt(1-4*x))/(2*x) is the o.g.f. of Catalan numbers A000108. %Y A112704 Eleventh column (m=10) of triangle A112705. %K A112704 nonn,easy %O A112704 0,2 %A A112704 _Wolfdieter Lang_, Oct 31 2005