Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.
A200448
Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.
Terms
- a(0) =10a(1) =44a(2) =144a(3) =486a(4) =1582a(5) =5478a(6) =18692a(7) =64782a(8) =223272a(9) =776430a(10) =2701660a(11) =9439702a(12) =33021250a(13) =115801892a(14) =406698282a(15) =1430840312a(16) =5040451088a(17) =17779563894a(18) =62784860258a(19) =221948186878a(20) =785340477204
External references
- oeis: A200448