Number of permutations p of [2n+1] such that 0p has a nonincreasing jump sequence beginning with n+1.
A303203
Number of permutations p of [2n+1] such that 0p has a nonincreasing jump sequence beginning with n+1.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =98a(4) =988a(5) =10872a(6) =129520a(7) =1609176a(8) =20786804a(9) =274792342a(10) =3719296036a(11) =51119572738a(12) =712918642042
External references
- oeis: A303203