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 A094946 #5 Aug 22 2013 03:03:03 %S A094946 1,1011,10110111,1011011101111,1011011101111011111, %T A094946 10110111011110111110111111,1011011101111011111011111101111111, %U A094946 1011011101111011111011111101111111011111111 %N A094946 a(n) is 10110(3 1's)0...0(n 1's). %C A094946 Sum of n-th term digits is C(n+2,2). %F A094946 a(n) = A094945((n+1)(n+2)/2+n) %F A094946 a(n) = a(n-1)*10^(n+1) + (10^n-1)/9. _Franklin T. Adams-Watters_, Aug 21 2013 %Y A094946 Cf. A023532. %K A094946 easy,nonn,base %O A094946 0,2 %A A094946 _Paul Barry_, May 25 2004 %E A094946 Name changed by _Franklin T. Adams-Watters_, Aug 21 2013