Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two adjacent terms unique.
A147891
Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two adjacent terms unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =54a(5) =232a(6) =1132a(7) =6024a(8) =45310a(9) =336372a(10) =2763524a(11) =23390652a(12) =212922998a(13) =2023344980a(14) =20591028914a(15) =219965702000
External references
- oeis: A147891