776430

Appears in sequences

• Number of 7X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 7 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=31A192707
• Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.at n=9A200448