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 A069940 #4 May 10 2013 12:45:01 %S A069940 0,1,4,9,16,25,36,49,64,81,1,3,7,13,21,31,43,57,73,91,4,7,12,19,28,39, %T A069940 52,67,84,103,9,13,19,27,37,49,63,79,97,117,16,21,28,37,48,61,76,93, %U A069940 112,133,25,31,39,49,61,75,91,109,129,151,36,43,52,63,76,91,108,127 %N A069940 (1/2)*((Sum of digits of n)^2 + (Sum of digits^2 of n)). %Y A069940 Cf. A069816, A007953, A003132. %K A069940 base,easy,nonn %O A069940 0,3 %A A069940 _Vladeta Jovovic_, May 04 2002