Number of permutations p of [n] whose absolute displacements |p(i)-i| are prime numbers.
A324372
Number of permutations p of [n] whose absolute displacements |p(i)-i| are prime numbers.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =2a(6) =9a(7) =28a(8) =144a(9) =640a(10) =2348a(11) =6740a(12) =37161a(13) =208186a(14) =1410137a(15) =8322892a(16) =47973920a(17) =231922220a(18) =1747678465a(19) =11712495736a(20) =101585559496a(21) =776251710048
External references
- oeis: A324372