Number of permutations of length n with exactly 3 rising or falling successions.
A086854
Number of permutations of length n with exactly 3 rising or falling successions.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =16a(6) =120a(7) =888a(8) =7198a(9) =64968a(10) =650644a(11) =7165200a(12) =86059242a(13) =1119549472a(14) =15682257872a(15) =235336043976
External references
- oeis: A086854