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 A125218 #11 Jul 13 2013 12:03:27 %S A125218 26,41,47,56,68,71,74,86,89,96,101,107,110,116,128,131,140,146,152, %T A125218 155,161,166,173,176,182,185,191,194,201,206,209,215,221,224,236,239, %U A125218 242,250 %N A125218 Numbers having at least two representations as 4*x*y-x-y with 1<=x<=y. %C A125218 A125203(a(n)) > 1. %C A125218 A124934 is the union of this sequence and A125217. %H A125218 Reinhard Zumkeller, <a href="/A125218/b125218.txt">Table of n, a(n) for n = 1..10000</a> %o A125218 (Haskell) %o A125218 import Data.List (findIndices) %o A125218 a125218 n = a125218_list !! (n-1) %o A125218 a125218_list = map (+ 1) $ findIndices (> 1) a125203_list %o A125218 -- _Reinhard Zumkeller_, Jan 02 2013 %K A125218 nonn %O A125218 1,1 %A A125218 _Reinhard Zumkeller_, Nov 24 2006