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 A205120 #5 Mar 30 2012 18:58:10 %S A205120 3,11,8,31,28,20,79,76,68,48,191,188,180,160,112,447,444,436,416,368, %T A205120 256,1023,1020,1012,992,944,832,576,2303,2300,2292,2272,2224,2112, %U A205120 1856,1280,5119,5116,5108,5088,5040,4928,4672,4096,2816,11263 %N A205120 Ordered differences of distinct numbers k*(2^(k-1)). %C A205120 For a guide to related sequences, see A204892. %e A205120 a(1)=s(2)-s(1)=4-1=3 %e A205120 a(2)=s(3)-s(1)=12-1=11 %e A205120 a(3)=s(3)-s(2)=12-4=8 %e A205120 a(4)=s(4)-s(1)=32-1=31 %e A205120 a(5)=s(4)-s(2)=32-4=28 %t A205120 (See the program at A205122.) %Y A205120 Cf. A205122, A204892. %K A205120 nonn %O A205120 1,1 %A A205120 _Clark Kimberling_, Jan 25 2012