%I #3 Mar 30 2012 18:52:04

%S -2,2,-1,1,-1,1,-1,1,-1,25,-25,477481,-477481,49,-49,13082689,

%T -13082689,1924313689,-1924313689,30489001321,-30489001321,

%U 730192467169,-730192467169,55867983514256281,-55867983514256281,73155570928609,-73155570928609

%N First differences of A172298.

%C Differences between squares of Bernoulli number denominators.

%F a(n) = A172298(n+1)-A172298(n).

%F a(2n) = -a(2n-1), n>=2 .

%K sign

%O 0,1

%A _Paul Curtz_, Jan 31 2010

%E Keyword:sign added, sequence extended by _R. J. Mathar_, Feb 02 2010