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%I #8 Jun 25 2022 21:51:41
%S 1,3,3,1,4,16,-13,9,-10,25,-11,28,-32,36,0,-28,7,17,-14,54,-33,28,-31,
%T 108,-136,64,-6,30,-48,123,-132,41,20,-4,4,-12,-52,108,-48,114,-138,
%U 156,-168,140,-56,27,-71,100,-144,48,67,-24,-51,240,-165,165,-174,48,-66,312,-384,156,-42,-82,96,179,-277,186
%N f(f(n+1))-f(f(n)), where f(0)=0, and for m>0, f(m) = sigma(m) = A000203(m).
%Y First differences of A051027.
%K sign
%O 0,2
%A _N. J. A. Sloane_, Nov 12 2005
%E Definition corrected by _N. J. A. Sloane_, Feb 14 2018