Number of permutations of length n with exactly 2 rising or falling successions.
A086853
Number of permutations of length n with exactly 2 rising or falling successions.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =2a(4) =10a(5) =48a(6) =256a(7) =1670a(8) =12846a(9) =112820a(10) =1108612a(11) =12032154a(12) =142852450a(13) =1840969784a(14) =25587270600a(15) =381460235918
External references
- oeis: A086853