Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.
A199831
Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.
Terms
- a(0) =140a(1) =1820a(2) =21364a(3) =273728a(4) =3579520a(5) =47040968a(6) =622300326a(7) =8281149188a(8) =110718596524
External references
- oeis: A199831