Number of permutations of floor(i*5/4), i=0..n-1, with all sums of two adjacent terms unique.
A147886
Number of permutations of floor(i*5/4), 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) =9344a(8) =67650a(9) =496204a(10) =4034008a(11) =33768568a(12) =337582870a(13) =3472186528a(14) =37790639750a(15) =425218900656
External references
- oeis: A147886