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 A026863 #4 Mar 30 2012 18:56:11 %S A026863 1,9,56,301,1504,7217,33821,156274,716116,3266558,14868789,67649170, %T A026863 307997855,1404343584,6416130302,29383457373,134915391509, %U A026863 621163581667,2867888163907,13278007815855,61645847283931,286977785803129 %N A026863 T(2n,n+3), T given by A026747. %K A026863 nonn %O A026863 3,2 %A A026863 _Clark Kimberling_