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 A031089 #4 Mar 30 2012 18:56:20 %S A031089 1,10,11,12,14,16,18,20,22,24,26,29,47,65,83,101,119,137,155,156,158, %T A031089 161,164,167,170,173,176,179,181,182,183,184,185,187,188,190,191,193, %U A031089 194,196,197,199,200,202,203,205,206,209,210 %N A031089 Position of n-th 1 in A031087. %K A031089 nonn %O A031089 1,2 %A A031089 _Clark Kimberling_