Number of permutations of [n] with exactly one increasing run of even length.
A317281
Number of permutations of [n] with exactly one increasing run of even length.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =52a(4) =299a(5) =1750a(6) =11195a(7) =83074a(8) =675304a(9) =5880354a(10) =55691345a(11) =570430818a(12) =6235219145a(13) =72578854088a(14) =898625380692
External references
- oeis: A317281