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 A251620 #5 Dec 06 2014 02:46:50 %S A251620 1,2,3,4,9,10,15,16,22,23,30,31,43,51,61,62,79,87,88,101,114,127,132, %T A251620 142,153,158,167,175,194,204,215,222,233,238,247,274,283,296,301,324, %U A251620 329,338,355,364,375,386,393,414,423,430,435,452,479,490,497,506 %N A251620 Distinct terms in A249943. %H A251620 Reinhard Zumkeller, <a href="/A251620/b251620.txt">Table of n, a(n) for n = 1..1000</a> %o A251620 (Haskell) %o A251620 import Data.List (group) %o A251620 a251620 n = a251620_list !! (n-1) %o A251620 a251620_list = map head $ group a249943_list %Y A251620 Cf. A249943, A251621. %K A251620 nonn %O A251620 1,2 %A A251620 _Reinhard Zumkeller_, Dec 06 2014