%I #11 Feb 18 2021 02:04:54
%S 3,1,3,0,2,1,2,2,0,3,0,2,2,1,1,2,1,2,1,2,1,2,1,1,2,1,2,1,2,1,1,2,1,2,
%T 2,0,2,2,1,2,0,3,1,1,2,1,1,2,2,1,1,2,1,2,1,2,1,1,2,1,2,1,2,1,2,1,1,2,
%U 1,2,1,2,1,1,2,2,1,1,2,1,2,1,1,2,2,0,3,0,3,0,2,2,1,1,2,1,2,1,2,1,1,2,2,0,3
%N Second differences of sequence A180005.
%C It is conjectured that this sequence is bounded between 0 and 3.
%H P. Diaconis and F. Mosteller, <a href="https://www.stat.berkeley.edu/~aldous/157/Papers/diaconis_mosteller.pdf">Methods of studying coincidences</a>, J. Amer. Statist. Assoc. 84 (1989), pp. 853-861.
%Y Cf. A180005.
%K nonn
%O 3,1
%A Mario O. Bourgoin (mob(AT)brandeis.edu), Aug 06 2010