Number of up-down sequences of length n and values in {1,2,...,n}.
A276312
Number of up-down sequences of length n and values in {1,2,...,n}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =31a(5) =246a(6) =2353a(7) =26585a(8) =345775a(9) =5094220a(10) =83833256a(11) =1524414737a(12) =30353430420a(13) =656851828075
External references
- oeis: A276312