Number of -3..3 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.
A200187
Number of -3..3 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.
Terms
- a(0) =1a(1) =6a(2) =14a(3) =48a(4) =144a(5) =482a(6) =1534a(7) =5148a(8) =16826a(9) =56918a(10) =188706a(11) =642300a(12) =2149072a(13) =7348408a(14) =24749244a(15) =84919630a(16) =287439908a(17) =988917344a(18) =3360535304a(19) =11586463472a(20) =39498606276a(21) =136421151864a(22) =466287543690
External references
- oeis: A200187