Number of permutations of {1,2,...,n} (n>=2) having a single run of even entries. For example, the permutation 513284679 has a single run of even entries: 2846.
A152873
Number of permutations of {1,2,...,n} (n>=2) having a single run of even entries. For example, the permutation 513284679 has a single run of even entries: 2846.
Terms
- a(0) =2a(1) =6a(2) =12a(3) =48a(4) =144a(5) =720a(6) =2880a(7) =17280a(8) =86400a(9) =604800a(10) =3628800a(11) =29030400a(12) =203212800a(13) =1828915200a(14) =14631321600a(15) =146313216000
External references
- oeis: A152873