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 A205016 #5 Mar 30 2012 18:58:10 %S A205016 4,10,6,18,14,8,28,24,18,10,40,36,30,22,12,54,50,44,36,26,14,70,66,60, %T A205016 52,42,30,16,88,84,78,70,60,48,34,18,108,104,98,90,80,68,54,38,20,130, %U A205016 126,120,112,102,90,76,60,42,22,154,150,144,136,126,114,100 %N A205016 Ordered differences of oblong numbers. %C A205016 For a guide to related sequences, see A204892. %e A205016 a(1)=s(2)-s(1)=6-2=4 %e A205016 a(2)=s(3)-s(1)=12-2=10 %e A205016 a(3)=s(3)-s(2)=12-6=6 %e A205016 a(4)=s(4)-s(1)= %e A205016 a(5)=s(4)-s(2)= %t A205016 (See the program at A205018.) %Y A205016 Cf. A205018, A204892. %K A205016 nonn %O A205016 1,1 %A A205016 _Clark Kimberling_, Jan 22 2012