Number of -2..2 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero.
A200159
Number of -2..2 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero.
Terms
- a(0) =4a(1) =8a(2) =34a(3) =76a(4) =276a(5) =700a(6) =2276a(7) =5992a(8) =18542a(9) =50488a(10) =151814a(11) =420680a(12) =1241580a(13) =3481308a(14) =10162686a(15) =28707288a(16) =83211126a(17) =236138900a(18) =681383716a(19) =1939299184a(20) =5579324890a(21) =15908310224a(22) =45678520824a(23) =130391096068
External references
- oeis: A200159