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 A025520 #5 Mar 30 2012 18:35:25 %S A025520 3,2,10,15,14,13,38,146,145,144,143,142,222,221,220,219,218,217,216, %T A025520 215,214,374,373,372,574,573,572,571,570,569,568,567,566,565,564,563, %U A025520 562,561,560,7694,7693,7692,7691,7690,7689,7688,7687,7686,7685,7684,7683,7682 %N A025520 Least k>1 such that reverse of first n terms of A022303 repeats beginning at k-th term. %K A025520 nonn %O A025520 1,1 %A A025520 _David W. Wilson_