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 A032763 #7 Mar 09 2015 09:35:21 %S A032763 0,2,4,6,8,1,1,21,41,61,82,2,22,42,62,83,3,23,43,63,84,4,24,44,64,85, %T A032763 5,25,45,65,86,6,26,46,66,87,7,27,47,67,88,8,28,48,68,89,9,29,49,69, %U A032763 81,1,21,41,61,81,101,121,141,161,181,201,221,241,261,281,301,321,341 %N A032763 Take list of even numbers, move left digit of each term to end of previous term. %H A032763 Reinhard Zumkeller, <a href="/A032763/b032763.txt">Table of n, a(n) for n = 0..10000</a> %e A032763 Here is how the first few terms are obtained: from 0 2 4 6 8 10 12 14 16 ... we get 0/ 2/ 4/ 6/ 8/ 1/0 1/2 1/4 1/6 ... hence 0,2,4,6,8,1,1,21,41,61,... %o A032763 (Haskell) %o A032763 a032763 n = a032763_list !! n %o A032763 a032763_list = 0 : map read (zipWith (++) vs (tail us)) :: [Integer] %o A032763 where (us,vs) = unzip $ map ((splitAt 1) . show) [0, 2 ..] %o A032763 -- _Reinhard Zumkeller_, Oct 10 2013 %Y A032763 Cf. A032759-A032764. %Y A032763 Cf. A005843. %K A032763 nonn,base %O A032763 0,2 %A A032763 _Patrick De Geest_, May 15 1998