Number of permutations p of [n] such that in 0p the sum of all jumps equals 2n.
A289489
Number of permutations p of [n] such that in 0p the sum of all jumps equals 2n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =15a(6) =104a(7) =644a(8) =3696a(9) =23388a(10) =151842a(11) =979110a(12) =6445659a(13) =43148963a(14) =290832906a(15) =1977914328a(16) =13574296048a(17) =93787977144a(18) =651970844448
External references
- oeis: A289489