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 A166066 #3 Mar 30 2012 17:26:30 %S A166066 1,10,34,114,604,38030,5432858,1686059380,1311379517778, %T A166066 809149064160894,457784289977786218,1525947633259287393334, %U A166066 12047520385077724826639078,349766720857095236902424845162,18224272090946071153017209199760102 %N A166066 a(n)=(Concatenation of A166064(1..n))/(Sum of A166064(1..n)). %H A166066 Zak Seidov, <a href="/A166066/b166066.txt">Table of n, a(n) for n = 1..33</a> %p A166066 A166064(1..7)=1,0,2,6,8,10,162; hence a(1)=1/1=1, a(2)=10/(1+0)=10, a(3)=102/(1+0+2)=34, a(4)=1026/(1+0+2+6)=34, a(5)=10268/(1+0+2+6+8)=604, a(6)=1026810/(1+0+2+6+8+10)=38030, a(7)=1026810162/(1+0+2+6+8+10+162)=5432858. %Y A166066 Cf. A166064. %K A166066 base,nonn %O A166066 1,2 %A A166066 _Zak Seidov_, Oct 05 2009