Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
A188253
Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =40a(1) =1284a(2) =12692a(3) =58824a(4) =193232a(5) =521124a(6) =1142180a(7) =2347608a(8) =4323448a(9) =7567844a(10) =12129300a(11) =19691552a(12) =29057776a(13) =42900188a(14) =61593740a(15) =86648240
External references
- oeis: A188253