Number of permutations of n elements in which alternating maximal rises and descents are all of length >= 2.
A277556
Number of permutations of n elements in which alternating maximal rises and descents are all of length >= 2.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =2a(4) =2a(5) =14a(6) =42a(7) =244a(8) =1208a(9) =7930a(10) =52710a(11) =405850a(12) =3310702a(13) =29742388a(14) =285103536a(15) =2943395390a(16) =32318674810a(17) =377660270510
External references
- oeis: A277556