Number of arrangements of n+2 nonzero numbers x(i) in -6..6 with the sum of x(i)*x(i+1) equal to zero.
A188246
Number of arrangements of n+2 nonzero numbers x(i) in -6..6 with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =144a(1) =436a(2) =6376a(3) =43440a(4) =521124a(5) =4875112a(6) =55994544a(7) =591604824a(8) =6764014136a(9) =75116513672a(10) =862566555260
External references
- oeis: A188246