253378

Appears in sequences

• a(n) = (A083108(n) - 1)/n.at n=7A083109
• a(n) = 225*n^2 - 199*n + 44.at n=34A156812
• Number of 2X5 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 2 zero-sum 5-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=10A192700