Number of permutations of floor(i*9/4), i=0..n-1, with all sums of two adjacent terms unique.
A147923
Number of permutations of floor(i*9/4), i=0..n-1, with all sums of two adjacent terms unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =96a(5) =376a(6) =2016a(7) =12168a(8) =109882a(9) =783536a(10) =6232926a(11) =59671520a(12) =718155492a(13) =7173976288a(14) =76938806480a(15) =981871005232
External references
- oeis: A147923