224735

Appears in sequences

• Expansion of 1/((1-x)*(1+2*x-2*x^2-2*x^3)).at n=14A077915
• Number of 1X7 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 1 zero-sum 7-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=18A192694