Number of permutations of floor(i*9/7), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
A147942
Number of permutations of floor(i*9/7), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =74a(5) =304a(6) =1424a(7) =7946a(8) =39908a(9) =231442a(10) =1351720a(11) =9447558a(12) =67300148a(13) =488187450a(14) =4266438488a(15) =36066619444
External references
- oeis: A147942