Number of arrangements of n+2 nonzero numbers x(i) in -4..4 with the sum of x(i)*x(i+1) equal to zero.
A188244
Number of arrangements of n+2 nonzero numbers x(i) in -4..4 with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =64a(1) =144a(2) =1504a(3) =7092a(4) =58824a(5) =368588a(6) =2880240a(7) =20265640a(8) =156028036a(9) =1154193268a(10) =8877588920a(11) =67251222980a(12) =518783061524
External references
- oeis: A188244