Number of permutations p of [2n] such that 0p has a nonincreasing jump sequence beginning with n.
A291688
Number of permutations p of [2n] such that 0p has a nonincreasing jump sequence beginning with n.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =36a(4) =327a(5) =3392a(6) =38795a(7) =469662a(8) =5935728a(9) =77416352a(10) =1035050705a(11) =14094000938a(12) =195075365778
External references
- oeis: A291688