Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
A147906
Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =96a(5) =444a(6) =2508a(7) =13216a(8) =74772a(9) =490758a(10) =3587634a(11) =32230992a(12) =247788878a(13) =2035600526a(14) =18463836692a(15) =192838249056
External references
- oeis: A147906