Number of leading even entries in all permutations of {1,2,...,n}.
A152665
Number of leading even entries in all permutations of {1,2,...,n}.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =16a(4) =60a(5) =540a(6) =3024a(7) =32256a(8) =241920a(9) =3024000a(10) =28512000a(11) =410572800a(12) =4670265600a(13) =76281004800
External references
- oeis: A152665