Number of permutations of floor(i*9/7), i=0..n-1, with all sums of two adjacent terms unique.
A147924
Number of permutations of floor(i*9/7), i=0..n-1, with all sums of two adjacent terms unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =74a(5) =304a(6) =1720a(7) =11448a(8) =73544a(9) =556452a(10) =4351440a(11) =39758684a(12) =380173176a(13) =3837917536a(14) =45346283462a(15) =532159158036
External references
- oeis: A147924