41631

Appears in sequences

• Number of 9X2 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 9 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=15A192709
• G.f. A(x) satisfies: 1-x = Sum_{n>=0} (A(x)^n + x^n)^n * (-x)^n.at n=13A246882
• a(n) is the number of nonnegative integers that can be represented by lighting only n segments on a 9-segment display, used by the Russian postal service.at n=23A350177