Number of -3..3 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing.
A200052
Number of -3..3 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing.
Terms
- a(0) =1a(1) =6a(2) =22a(3) =78a(4) =288a(5) =1098a(6) =4224a(7) =16432a(8) =64310a(9) =253692a(10) =1003374a(11) =3992358a(12) =15908668a(13) =63684848a(14) =255153798a(15) =1026057576a(16) =4127971346a(17) =16658240722a(18) =67237254862a(19) =272092306164
External references
- oeis: A200052