Number of permutations of [n] with an even number of rises.
A128103
Number of permutations of [n] with an even number of rises.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =12a(5) =68a(6) =360a(7) =2384a(8) =20160a(9) =185408a(10) =1814400a(11) =19781504a(12) =239500800a(13) =3124694528a(14) =43589145600a(15) =652885305344
External references
- oeis: A128103