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 A224778 #4 May 09 2013 06:59:43 %S A224778 2,5,6,8,9,10,11,13,14,15,17,18,19,20,21,22,23,24,25,26,27,29,30,31, %T A224778 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,49,50,51,52,53,54,55, %U A224778 56,57,58,59,60,61,62,63,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79 %N A224778 One half of the even numbers that are the sum of four nonzero squares. %C A224778 These are the even numbers of A000414 divided by 2. %F A224778 a(n) is one half of the n-th even number of the sequence A000414. %Y A224778 Cf. A000414. %K A224778 nonn %O A224778 1,1 %A A224778 _Wolfdieter Lang_, May 09 2013