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 A261645 #4 Aug 31 2015 01:08:43 %S A261645 0,2,5,-3,-4,14,-3,-3,-4,-4,30,-3,-3,-5,-7,-5,-5,60,-3,-3,-5,-5,-3,-3, %T A261645 -4,-4,-4,-5,-7,-4,-5,-5,124,-3,-3,-5,-5,-3,-3,-6,-8,-3,-3,-4,-4,-7, %U A261645 -4,-4,-5,-5,-5,-7,-7,-4,-5,-9,-5,-4,-4,252,-3,-3,-3,-6,-3 %N A261645 First differences of A261644, seen as flattened list. %H A261645 Reinhard Zumkeller, <a href="/A261645/b261645.txt">Table of n, a(n) for n = 1..10000</a> %o A261645 (Haskell) %o A261645 a261645 n = a261645_list !! (n-1) %o A261645 a261645_list = zipWith (-) (tail a261644_list) a261644_list %Y A261645 Cf. A261644, A261018. %K A261645 sign %O A261645 1,2 %A A261645 _Reinhard Zumkeller_, Aug 31 2015