355396

Appears in sequences

• Number of arrangements of n+2 nonzero numbers x(i) in -3..3 with the sum of x(i)*x(i+1) equal to zero.at n=6A188243
• T(n,k)=Number of arrangements of n+2 nonzero numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero.at n=42A188249
• Number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.at n=2A188255
• a(n) = Sum_{k=0..floor(4*n/7)} binomial(k+3,4*n-7*k).at n=34A390039