Number of permutations of [n] avoiding ascents from odd to even numbers.
A231601
Number of permutations of [n] avoiding ascents from odd to even numbers.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =8a(5) =54a(6) =162a(7) =1536a(8) =6144a(9) =75000a(10) =375000a(11) =5598720a(12) =33592320a(13) =592950960a(14) =4150656720a(15) =84557168640a(16) =676457349120
External references
- oeis: A231601