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 A026884 #4 Mar 30 2012 18:56:11 %S A026884 1,6,29,132,591,2648,11970,54818,254868,1204042,5779861,28178306, %T A026884 139394333,698911166,3547422416,18204441884,94339586414,493148411592, %U A026884 2597699326194,13776442755524,73498738275926,394203045846692 %N A026884 T(2n,n+2), T given by A026769. %K A026884 nonn %O A026884 2,2 %A A026884 _Clark Kimberling_