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%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