%I A147923
%S A147923 1,2,6,16,96,376,2016,12168,109882,783536,6232926,59671520,718155492,
%T A147923 7173976288,76938806480,981871005232
%N A147923 Number of permutations of floor(i*9/4), i=0..n-1, with all sums of two 
               adjacent terms unique.
%Y A147923 Sequence in context: A147950 A147941 A147932 this_sequence A144690 A118305 
               A139629
%Y A147923 Adjacent sequences: A147920 A147921 A147922 this_sequence A147924 A147925 
               A147926
%K A147923 nonn
%O A147923 1,2
%A A147923 Ron Hardin (rhhardin(AT)att.net) Nov 17 2008