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Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two adjacent terms unique.
0

%I #5 Apr 07 2021 19:25:28

%S 1,2,6,16,54,232,1132,6024,45310,336372,2763524,23390652,212922998,

%T 2023344980,20591028914,219965702000

%N Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two adjacent terms unique.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 17 2008