Number of arrangements of n+2 nonzero numbers x(i) in -7..7 with the sum of x(i)*x(i+1) equal to zero.
A188247
Number of arrangements of n+2 nonzero numbers x(i) in -7..7 with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =196a(1) =532a(2) =10564a(3) =75080a(4) =1142180a(5) =11953848a(6) =168083116a(7) =2026547348a(8) =27843005992a(9) =355600251460
External references
- oeis: A188247