Number of permutations sigma such that |sigma(i+j)-sigma(i)| >= 5 for 1 <= i <= n - j, 1 <= j <= 4.
A322308
Number of permutations sigma such that |sigma(i+j)-sigma(i)| >= 5 for 1 <= i <= n - j, 1 <= j <= 4.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =0a(22) =0a(23) =0a(24) =0a(25) =2a(26) =128a(27) =6320a(28) =344872
External references
- oeis: A322308