A169758 - OEIS

%I #2 Mar 30 2012 16:51:44

%S 1,1,2,1,1,1,2,2,0,0,3,2,0,1,2,3,0,-2,5,1,0,0,3,4,-1,-2,3,4,0,0,2,4,0,

%T 0,3,0,-1,-4,12,1,-1,-5,6,4,-1,-1,3,6,0,-6,5,4,-1,-2,3,7,0,-5,1,6,2,

%U -1,1,5,0,6,-9,12,-9,1,8,4,-6,-8,14,-11,23,-41,58,-19,0,-7,6,3,-3,-7,13,6,-1,-10,4,8,1,-3,2,8,1,-2,3,0

%N Second differences of A170907.

%C I wish I had a recurrence for this sequence!

%Y Cf. A170907, A169757.

%K sign

%O 0,3

%A _N. J. A. Sloane_, May 06 2010