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%I #2 Mar 30 2012 18:51:59
%S 1,2,2,4,4,5,5,5,6,7,7,7,8,8,8,9,9,10,10,10,10,11,11,12,11,12,13,12,
%T 13,13,13,14,14,14,15,14,15,15,16,16,15,17,16,17,17,17,17,18,17,19,18,
%U 18,19,19,19,19
%N First differences of A152737.
%K nonn
%O 0,2
%A _Paul Curtz_, Dec 14 2008