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 A026341 #4 Mar 30 2012 18:56:06 %S A026341 0,3,6,14,25,24,38,48,75,89,114,142,141,160,193,229,228,267,293,354, %T A026341 402,434,487,486,602,601,663,728,771,770,840,886,961,1039,1038,1204, %U A026341 1203,1258,1257,1439,1438,1533,1595,1695,1836,1904 %N A026341 a(n) = sum of the numbers between the two n's in A026338. %K A026341 nonn %O A026341 1,2 %A A026341 _Clark Kimberling_