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 A205128 #5 Mar 30 2012 18:58:10 %S A205128 5,14,9,27,22,13,44,39,30,17,65,60,51,38,21,90,85,76,63,46,25,119,114, %T A205128 105,92,75,54,29,152,147,138,125,108,87,62,33,189,184,175,162,145,124, %U A205128 99,70,37,230,225,216,203,186,165,140,111,78,41,275,270,261 %N A205128 Ordered differences of distinct hexagonal numbers. %C A205128 For a guide to related sequences, see A204892. %e A205128 a(1)=s(2)-s(1)=6-1=5 %e A205128 a(2)=s(3)-s(1)=15-1=14 %e A205128 a(3)=s(3)-s(2)=15-6=9 %e A205128 a(4)=s(4)-s(1)=28-1=27 %e A205128 a(5)=s(4)-s(2)=28-6=22 %t A205128 (See the program at A205130.) %Y A205128 Cf. A205130, A204892. %K A205128 nonn %O A205128 1,1 %A A205128 _Clark Kimberling_, Jan 25 2012