Number of arrangements of n+2 nonzero numbers x(i) in -5..5 with the sum of x(i)*x(i+1) equal to zero.
A188245
Number of arrangements of n+2 nonzero numbers x(i) in -5..5 with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =100a(1) =208a(2) =3292a(3) =16484a(4) =193232a(5) =1399640a(6) =14715004a(7) =123729664a(8) =1247614580a(9) =11199296500a(10) =110995324320
External references
- oeis: A188245