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 A227839 #12 Apr 10 2014 00:20:45 %S A227839 0,1,1,0,0,0,0,1,1,0,0,0,0,2,1,0,0,0,0,1,2,0,2,1,0,0,0,0,1,2,0,0,0,0, %T A227839 1,1,0,1,1,0,0,0,0,2,4,0,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,3,2,0,0,0,0,1, %U A227839 2,0,0,0,0,2,1,0,1,2,0,0,0,0,2,1,0,0,0,0,1,1,0,0,0,0,1,4,0,0,0,0,0,0,1,0,0,2,0,0,2 %N A227839 3^a(n) is the highest power of 3 dividing A005132(n). %C A227839 The 3-adic valuation of Recamán's sequence A005132. %H A227839 Reinhard Zumkeller, <a href="/A227839/b227839.txt">Table of n, a(n) for n = 1..10000</a> %H A227839 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a> %o A227839 (Haskell) %o A227839 a227839 = a007949 . a005132 -- _Reinhard Zumkeller_, Aug 05 2013 %Y A227839 Cf. A005132, A227838, A007949. %K A227839 nonn %O A227839 1,14 %A A227839 _N. J. A. Sloane_, Aug 04 2013