%I A071413
%S A071413 0,1,1,4,5,4,2,11,13,4,6,15,14,11,3,26,29,4,14,23,26,15,7,38,38,11,15,
%T A071413 38,31,26,4,57,61,4,30,39,50,23,15,62,66,15,27,58,51,38,8,85,86,11,39,
%U A071413 62,67,38,16,93,87,26,32,85,64,57,5
%V A071413 0,-1,1,-4,5,-4,2,-11,13,-4,6,-15,14,-11,3,-26,29,-4,14,-23,26,-15,7,-38,
               38,-11,15,
%W A071413 -38,31,-26,4,-57,61,-4,30,-39,50,-23,15,-62,66,-15,27,-58,51,-38,8,-85,
               86,-11,39,-62,
%X A071413 67,-38,16,-93,87,-26,32,-85,64,-57,5
%N A071413 a(n) = if n=0 then 0 else a(floor(n/2))+n*(-1)^(n mod 2).
%H A071413 R. Stephan, <a href="somedcgf.html">Some divide-and-conquer sequences 
               ...</a>
%H A071413 R. Stephan, <a href="a079944.ps">Table of generating functions</a>
%Y A071413 Cf. A005187.
%Y A071413 Sequence in context: A092141 A120867 A011427 this_sequence A161811 A016717 
               A031349
%Y A071413 Adjacent sequences: A071410 A071411 A071412 this_sequence A071414 A071415 
               A071416
%K A071413 sign
%O A071413 0,4
%A A071413 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 24 200o