Number of arrangements of n+1 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
A188349
Number of arrangements of n+1 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =5a(1) =45a(2) =257a(3) =4201a(4) =45801a(5) =1171345a(6) =25217201a(7) =870473329a(8) =30807035021
External references
- oeis: A188349