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 A026059 #3 Mar 30 2012 18:56:04 %S A026059 5,10,16,25,36,49,65,83,105,130,158,190,225,265,309,357,410,467,530, %T A026059 598,671,750,834,925,1022,1125,1235,1351,1475,1606,1744,1890,2043, %U A026059 2205,2375,2553,2740,2935,3140,3354,3577,3810,4052,4305,4568,4841,5125,5419,5725,6042,6370,6710,7061,7425,7801,8189,8590 %N A026059 a(n) = (d(n)-r(n))/5, where d = A026057 and r is the periodic sequence with fundamental period (1,0,3,1,0). %K A026059 nonn %O A026059 4,1 %A A026059 _Clark Kimberling_