One-half the number of permutations of length n without rising or falling successions.
A001266
One-half the number of permutations of length n without rising or falling successions.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =7a(4) =45a(5) =323a(6) =2621a(7) =23811a(8) =239653a(9) =2648395a(10) =31889517a(11) =415641779a(12) =5830753109a(13) =87601592187
External references
- oeis: A001266