%N A127697 Number of permutations of {1,2,...,n} where adjacent elements differ in value by 3 or more. %S A127697 0,0,0,0,0,2,32,368,3984,64904,947168 My calcs give: 0,0,0,0,0,2,32,368,3984,44304,521606,6564318 Anyone may wish to check/extend these? Any fornula? Thanks, Zak