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 A117070 #9 May 01 2015 07:29:50 %S A117070 1,2,4,5,8,9,10,11,12,15,16,17,18,19,20,21,22,23,24,27,28,29,30,31,32, %T A117070 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,50,51,52,53,54,55,56,57, %U A117070 58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75 %N A117070 Number at start of segment n of A078783. %C A117070 a(n) = A078783(3*n-2). %D A117070 N. J. A. Sloane and Allan Wilks, On sequences of Recaman type, paper in preparation, 2006. %H A117070 Reinhard Zumkeller, <a href="/A117070/b117070.txt">Table of n, a(n) for n = 1..10000</a> %o A117070 (Haskell) %o A117070 import Data.List (transpose, unfoldr) %o A117070 a117070 n = a117070_list !! (n-1) %o A117070 a117070_list = tSegments !! 0 %o A117070 tSegments = transpose $ unfoldr (Just . splitAt 3) $ tail a078783_list %o A117070 -- _Reinhard Zumkeller_, May 01 2015 %Y A117070 Cf. A078783, A117071, A117072. %K A117070 nonn %O A117070 1,2 %A A117070 _N. J. A. Sloane_, Apr 18 2006