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 A166056 #2 Mar 31 2012 13:21:20 %S A166056 103,409,589,998,1297,1364,1891,1952,2078,2114,2119,2402,2473,2485, %T A166056 2789,3067,3182,3212,3458,3611,3788,3812,4022,4472,4535,4579,5264, %U A166056 5438,5763,5852,5858,5953,6098,6133,6535,6794,6854,7034,7309,7412 %N A166056 Fourth row of A166091. Positions of 7's in A166086. %Y A166056 See A166057. %K A166056 nonn %O A166056 1,1 %A A166056 _Antti Karttunen_, Oct 08 2009