Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).

A152668

Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).

Terms

    a(0) =2a(1) =6a(2) =36a(3) =192a(4) =1440a(5) =10800a(6) =100800a(7) =967680a(8) =10886400a(9) =127008000a(10) =1676505600a(11) =22992076800a(12) =348713164800

External references